biological immortality
Biological immortality (sometimes referred to as bio-indefinite mortality) is a state in which the rate of mortality from senescence is stable or decreasing, thus decoupling it from chronological age. Various unicellular and multicellular species, ...
.
Some scientists,
futurist
Futurists (also known as futurologists, prospectivists, foresight practitioners and horizon scanners) are people whose specialty or interest is futurology or the attempt to systematically explore predictions and possibilities abou ...
s, and philosophers have theorized about the immortality of the human body, with some suggesting that human immortality may be achievable in the first few decades of the 21st century with the help of certain
technologies
Technology is the application of knowledge to reach practical goals in a specifiable and reproducible way. The word ''technology'' may also mean the product of such an endeavor. The use of technology is widely prevalent in medicine, science, ...
such as
mind uploading
Mind uploading is a speculative process of whole brain emulation in which a brain scan is used to completely emulate the mental state of the individual in a digital computer. The computer would then run a simulation of the brain's information pr ...
(
digital immortality
Digital immortality (or "virtual immortality") is the hypothetical concept of storing (or transferring) a person's personality in digital substrate, i.e., a computer, robot or cyberspace (mind uploading). The result might look like an avatar beh ...
). Other advocates believe that
life extension
Life extension is the concept of extending the human life expectancy, lifespan, either modestly through improvements in medicine or dramatically by increasing the maximum lifespan beyond its generally-settled oldest people, limit of 125 years.
S ...
is a more achievable goal in the short term, with immortality awaiting further research breakthroughs. The absence of aging would provide humans with biological immortality, but not invulnerability to death by disease or
injury
An injury is any physiological damage to living tissue caused by immediate physical stress. An injury can occur intentionally or unintentionally and may be caused by blunt trauma, penetrating trauma, burning, toxic exposure, asphyxiation, o ...
. Whether the process of internal immortality is delivered within the upcoming years depends chiefly on research (and in neuron research in the case of internal immortality through an immortalized cell line) in the former view and perhaps is an awaited goal in the latter case.
What form an unending human life would take, or whether an immaterial
soul
In many religious and philosophical traditions, there is a belief that a soul is "the immaterial aspect or essence of a human being".
Etymology
The Modern English noun ''soul'' is derived from Old English ''sāwol, sāwel''. The earliest attes ...
exists and possesses immortality, has been a major point of focus of religion, as well as the subject of speculation and debate. In religious contexts, immortality is often stated to be one of the promises of divinities to human beings who perform
virtue
Virtue ( la, virtus) is moral excellence. A virtue is a trait or quality that is deemed to be morally good and thus is valued as a foundation of principle and good moral being. In other words, it is a behavior that shows high moral standard ...
or follow
divine law
Divine law is any body of law that is perceived as deriving from a transcendent source, such as the will of God or godsin contrast to man-made law or to secular law. According to Angelos Chaniotis and Rudolph F. Peters, divine laws are typically ...
.
Definitions
Scientific
Life extension
Life extension is the concept of extending the human life expectancy, lifespan, either modestly through improvements in medicine or dramatically by increasing the maximum lifespan beyond its generally-settled oldest people, limit of 125 years.
S ...
technologies promise a path to complete
rejuvenation
Rejuvenation is a medical discipline focused on the practical reversal of the aging process.
Rejuvenation is distinct from life extension. Life extension strategies often study the causes of aging and try to oppose those causes in order to slow ...
.
Cryonics
Cryonics (from el, κρύος ''kryos'' meaning 'cold') is the low-temperature freezing (usually at ) and storage of human remains, with the speculative hope that resurrection may be possible in the future. Cryonics is regarded with skepticis ...
holds out the hope that the dead can be revived in the future, following sufficient medical advancements. While, as shown with creatures such as hydra and
Planarian
A planarian is one of the many flatworms of the traditional class Turbellaria. It usually describes free-living flatworms of the order Tricladida (triclads), although this common name is also used for a wide number of free-living platyhelmint ...
worms, it is indeed possible for a creature to be biologically immortal, it is not known if it will be possible for humans in the near-future.
Religious
Immortality in religion refers usually to either the belief in physical immortality or a more spiritual ''
afterlife
The afterlife (also referred to as life after death) is a purported existence in which the essential part of an individual's identity or their stream of consciousness continues to live after the death of their physical body. The surviving ess ...
''. In traditions such as ancient Egyptian beliefs, Mesopotamian beliefs and ancient Greek beliefs, the immortal gods consequently were considered to have physical bodies. In Mesopotamian and Greek religion, the gods also made certain men and women physically immortal, whereas in Christianity, many believe that all true believers will be resurrected to physical immortality. Similar beliefs that physical immortality is possible are held by
Rastafarians
Rastafari, sometimes called Rastafarianism, is a religion that developed in Jamaica during the 1930s. It is classified as both a new religious movement and a social movement by scholars of religion. There is no central authority in control of ...
Physical immortality is a state of life that allows a person to avoid death and maintain conscious thought. It can mean the unending existence of a person from a physical source other than organic life, such as a computer.
Pursuit of physical immortality before the advent of modern science included
alchemists
Alchemy (from Arabic: ''al-kīmiyā''; from Ancient Greek: χυμεία, ''khumeía'') is an ancient branch of natural philosophy, a philosophical and protoscientific tradition that was historically practiced in China, India, the Muslim world, ...
seeking to create the
Philosopher's Stone
The philosopher's stone or more properly philosophers' stone (Arabic: حجر الفلاسفة, , la, lapis philosophorum), is a mythic alchemical substance capable of turning base metals such as mercury into gold (, from the Greek , "gold", a ...
,Theophrastus Paracelsus. ''The Book of the Revelation of Hermes''. 16th century and various cultures' legends such as the
Fountain of Youth
The Fountain of Youth is a mythical spring which allegedly restores the youth of anyone who drinks or bathes in its waters. Tales of such a fountain have been recounted around the world for thousands of years, appearing in the writings of Herod ...
or the
Peaches of Immortality
In Chinese mythology, Peaches of Immortality ( or ) are consumed by the immortals due to their mystic virtue of conferring longevity on all who eat them. Peaches symbolizing immortality (or the wish for a long and healthy life) are a common symbo ...
inspiring attempts at discovering elixirs of life.
Modern scientific trends, such as
cryonics
Cryonics (from el, κρύος ''kryos'' meaning 'cold') is the low-temperature freezing (usually at ) and storage of human remains, with the speculative hope that resurrection may be possible in the future. Cryonics is regarded with skepticis ...
,
digital immortality
Digital immortality (or "virtual immortality") is the hypothetical concept of storing (or transferring) a person's personality in digital substrate, i.e., a computer, robot or cyberspace (mind uploading). The result might look like an avatar beh ...
, breakthroughs in
rejuvenation
Rejuvenation is a medical discipline focused on the practical reversal of the aging process.
Rejuvenation is distinct from life extension. Life extension strategies often study the causes of aging and try to oppose those causes in order to slow ...
, or predictions of an impending
technological singularity
The technological singularity—or simply the singularity—is a hypothetical future point in time at which technological growth becomes uncontrollable and irreversible, resulting in unforeseeable changes to human civilization. According to the m ...
, to achieve genuine human physical immortality, must still overcome all causes of death to succeed:
Causes of death
There are three main causes of death:
aging
Ageing ( BE) or aging ( AE) is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. In ...
,
disease
A disease is a particular abnormal condition that negatively affects the structure or function of all or part of an organism, and that is not immediately due to any external injury. Diseases are often known to be medical conditions that a ...
, and
injury
An injury is any physiological damage to living tissue caused by immediate physical stress. An injury can occur intentionally or unintentionally and may be caused by blunt trauma, penetrating trauma, burning, toxic exposure, asphyxiation, o ...
Such issues can be resolved with the solutions provided in research to any end providing such alternate theories at present that require unification.
Aging
Aubrey de Grey
Aubrey David Nicholas Jasper de Grey (; born 20 April 1963) is an English author and biomedical gerontologist. He is the author of ''The Mitochondrial Free Radical Theory of Aging'' (1999) and co-author of ''Ending Aging'' (2007). He is known ...
, a leading researcher in the field, defines
aging
Ageing ( BE) or aging ( AE) is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. In ...
as "a collection of cumulative changes to the
molecular
A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion. In quantum physics, organic chemistry, and bioche ...
and
cellular
Cellular may refer to:
*Cellular automaton, a model in discrete mathematics
* Cell biology, the evaluation of cells work and more
* ''Cellular'' (film), a 2004 movie
*Cellular frequencies, assigned to networks operating in cellular RF bands
*Cell ...
structure of an adult
organism
In biology, an organism () is any living system that functions as an individual entity. All organisms are composed of cells (cell theory). Organisms are classified by taxonomy into groups such as multicellular animals, plants, and ...
, which result in essential
metabolic
Metabolism (, from el, μεταβολή ''metabolē'', "change") is the set of life-sustaining chemical reactions in organisms. The three main functions of metabolism are: the conversion of the energy in food to energy available to run cell ...
processes, but which also, once they progress far enough, increasingly disrupt metabolism, resulting in
pathology
Pathology is the study of the causes and effects of disease or injury. The word ''pathology'' also refers to the study of disease in general, incorporating a wide range of biology research fields and medical practices. However, when used in ...
and death." The current causes of aging in humans are cell loss (without replacement),
DNA damage
DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. In human cells, both normal metabolic activities and environmental factors such as radiation can cause DNA da ...
,
oncogenic
Carcinogenesis, also called oncogenesis or tumorigenesis, is the formation of a cancer, whereby normal cells are transformed into cancer cells. The process is characterized by changes at the cellular, genetic, and epigenetic levels and abno ...
nuclear
Nuclear may refer to:
Physics
Relating to the nucleus of the atom:
* Nuclear engineering
*Nuclear physics
*Nuclear power
*Nuclear reactor
*Nuclear weapon
*Nuclear medicine
*Radiation therapy
*Nuclear warfare
Mathematics
*Nuclear space
*Nuclear ...
mutation
In biology, a mutation is an alteration in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA. Viral genomes contain either DNA or RNA. Mutations result from errors during DNA or viral replication, mi ...
s and
epimutation
In biology, epigenetics is the study of stable phenotypic changes (known as ''marks'') that do not involve alterations in the DNA sequence. The Greek prefix '' epi-'' ( "over, outside of, around") in ''epigenetics'' implies features that are " ...
s, cell
senescence
Senescence () or biological aging is the gradual deterioration of functional characteristics in living organisms. The word ''senescence'' can refer to either cellular senescence or to senescence of the whole organism. Organismal senescence inv ...
,
mitochondria
A mitochondrion (; ) is an organelle found in the Cell (biology), cells of most Eukaryotes, such as animals, plants and Fungus, fungi. Mitochondria have a double lipid bilayer, membrane structure and use aerobic respiration to generate adenosi ...
l mutations,
lysosomal
A lysosome () is a membrane-bound organelle found in many animal Cell (biology), cells. They are spherical Vesicle (biology and chemistry), vesicles that contain Hydrolysis, hydrolytic enzymes that can break down many kinds of biomolecules. A ly ...
aggregates, extracellular aggregates, random extracellular cross-linking,
immune system
The immune system is a network of biological processes that protects an organism from diseases. It detects and responds to a wide variety of pathogens, from viruses to parasitic worms, as well as cancer cells and objects such as wood splinte ...
decline, and
endocrine
The endocrine system is a messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs. In vertebrates, the hypothalamus is the neu ...
changes. Eliminating aging would require finding a solution to each of these causes, a program de Grey calls engineered negligible senescence. There is also a huge body of knowledge indicating that change is characterized by the loss of molecular fidelity.
Disease
Disease is theoretically surmountable by technology. In short, it is an abnormal condition affecting the body of an organism, something the body shouldn't typically have to deal with its natural make up. Human understanding of
genetics
Genetics is the study of genes, genetic variation, and heredity in organisms.Hartl D, Jones E (2005) It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinian friar wor ...
is leading to cures and treatments for a myriad of previously incurable diseases. The mechanisms by which other diseases do damage are becoming better understood. Sophisticated methods of detecting diseases early are being developed.
Preventative medicine
Preventive healthcare, or prophylaxis, consists of measures taken for the purposes of disease prevention.Hugh R. Leavell and E. Gurney Clark as "the science and art of preventing disease, prolonging life, and promoting physical and mental hea ...
is becoming better understood. Neurodegenerative diseases like
Parkinson's
Parkinson's disease (PD), or simply Parkinson's, is a long-term degenerative disorder of the central nervous system that mainly affects the motor system. The symptoms usually emerge slowly, and as the disease worsens, non-motor symptoms becom ...
and
Alzheimer's
Alzheimer's disease (AD) is a neurodegenerative disease that usually starts slowly and progressively worsens. It is the cause of 60–70% of cases of dementia. The most common early symptom is difficulty in remembering recent events. As t ...
may soon be curable with the use of
stem cells
In multicellular organisms, stem cells are undifferentiated or partially differentiated cells that can differentiate into various types of cells and proliferate indefinitely to produce more of the same stem cell. They are the earliest type o ...
. Breakthroughs in
cell biology
Cell biology (also cellular biology or cytology) is a branch of biology that studies the structure, function, and behavior of cells. All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and ...
and
telomere
A telomere (; ) is a region of repetitive nucleotide sequences associated with specialized proteins at the ends of linear chromosomes. Although there are different architectures, telomeres, in a broad sense, are a widespread genetic feature mos ...
research are leading to treatments for cancer.
Vaccine
A vaccine is a biological Dosage form, preparation that provides active acquired immunity to a particular infectious disease, infectious or cancer, malignant disease. The safety and effectiveness of vaccines has been widely studied and verifie ...
s are being researched for AIDS and
tuberculosis
Tuberculosis (TB) is an infectious disease usually caused by '' Mycobacterium tuberculosis'' (MTB) bacteria. Tuberculosis generally affects the lungs, but it can also affect other parts of the body. Most infections show no symptoms, in ...
. Genes associated with
type 1 diabetes
Type 1 diabetes (T1D), formerly known as juvenile diabetes, is an autoimmune disease that originates when cells that make insulin (beta cells) are destroyed by the immune system. Insulin is a hormone required for the cells to use blood sugar for ...
and certain types of cancer have been discovered, allowing for new therapies to be developed. Artificial devices attached directly to the
nervous system
In biology, the nervous system is the highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body. The nervous system detects environmental changes th ...
may restore sight to the blind. Drugs are being developed to treat a myriad of other diseases and ailments.
Trauma
Physical trauma
An injury is any physiological damage to living tissue caused by immediate physical stress. An injury can occur intentionally or unintentionally and may be caused by blunt trauma, penetrating trauma, burning, toxic exposure, asphyxiation, ...
would remain as a threat to perpetual physical life, as an otherwise immortal person would still be subject to unforeseen accidents or catastrophes. The speed and quality of
paramedic
A paramedic is a registered healthcare professional who works autonomously across a range of health and care settings and may specialise in clinical practice, as well as in education, leadership, and research.
Not all ambulance personnel are p ...
response remains a determining factor in surviving severe trauma. A body that could automatically repair itself from severe trauma, such as speculated uses for
nanotechnology
Nanotechnology, also shortened to nanotech, is the use of matter on an atomic, molecular, and supramolecular scale for industrial purposes. The earliest, widespread description of nanotechnology referred to the particular technological goal o ...
, would mitigate this factor. The brain cannot be risked to trauma if a continuous physical life is to be maintained. This aversion to trauma risk to the brain would naturally result in significant behavioral changes that would render physical immortality undesirable for some people.
Environmental change
Organisms otherwise unaffected by these causes of death would still face the problem of obtaining sustenance (whether from currently available agricultural processes or from hypothetical future technological processes) in the face of changing availability of suitable resources as environmental conditions change. After avoiding aging, disease, and trauma, death through resource limitation is still possible, such as
hypoxia
Hypoxia means a lower than normal level of oxygen, and may refer to:
Reduced or insufficient oxygen
* Hypoxia (environmental), abnormally low oxygen content of the specific environment
* Hypoxia (medical), abnormally low level of oxygen in the tis ...
or
starvation
Starvation is a severe deficiency in caloric energy intake, below the level needed to maintain an organism's life. It is the most extreme form of malnutrition. In humans, prolonged starvation can cause permanent organ damage and eventually, dea ...
.
If there is no limitation on the degree of gradual mitigation of risk then it is possible that the
cumulative probability
In probability theory and statistics, the cumulative distribution function (CDF) of a real-valued random variable X, or just distribution function of X, evaluated at x, is the probability that X will take a value less than or equal to x.
Ev ...
of death over an infinite horizon is less than
certainty
Certainty (also known as epistemic certainty or objective certainty) is the epistemic property of beliefs which a person has no rational grounds for doubting. One standard way of defining epistemic certainty is that a belief is certain if and ...
Biological immortality is an absence of aging. Specifically it is the absence of a sustained increase in rate of mortality as a function of chronological age. A cell or organism that does not experience aging, or ceases to age at some point, is biologically immortal.
Biologist
A biologist is a scientist who conducts research in biology. Biologists are interested in studying life on Earth, whether it is an individual Cell (biology), cell, a multicellular organism, or a Community (ecology), community of Biological inter ...
s have chosen the word "immortal" to designate cells that are not limited by the Hayflick limit, where cells no longer divide because of
DNA damage
DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. In human cells, both normal metabolic activities and environmental factors such as radiation can cause DNA da ...
or shortened
telomere
A telomere (; ) is a region of repetitive nucleotide sequences associated with specialized proteins at the ends of linear chromosomes. Although there are different architectures, telomeres, in a broad sense, are a widespread genetic feature mos ...
s. The first and still most widely used immortal cell line is
HeLa
HeLa (; also Hela or hela) is an immortalized cell line used in scientific research. It is the oldest and most commonly used human cell line. The line is derived from cervical cancer cells taken on February 8, 1951, named after Henrietta La ...
, developed from cells taken from the malignant cervical tumor of
Henrietta Lacks
Henrietta Lacks (born Loretta Pleasant; August 1, 1920 – October 4, 1951) Note: Some sources report her birthday as August 2, 1920, vs. August 1, 1920. was an African-American woman whose cancer cells are the source of the HeLa cell line ...
without her consent in 1951. Prior to the 1961 work of
Leonard Hayflick
Leonard Hayflick (born 20 May 1928) is a Professor of Anatomy at the UCSF School of Medicine, and was Professor of Medical Microbiology at Stanford University School of Medicine. He is a past president of the Gerontological Society of America and ...
, there was the erroneous belief fostered by
Alexis Carrel
Alexis Carrel (; 28 June 1873 – 5 November 1944) was a French surgeon and biologist who was awarded the Nobel Prize in Physiology or Medicine in 1912 for pioneering vascular suturing techniques. He invented the first perfusion pump with Charle ...
that all normal
somatic
Somatic may refer to:
* Somatic (biology), referring to the cells of the body in contrast to the germ line cells
** Somatic cell, a non-gametic cell in a multicellular organism
* Somatic nervous system, the portion of the vertebrate nervous sys ...
cells are immortal. By preventing cells from reaching senescence one can achieve biological immortality; telomeres, a "cap" at the end of DNA, are thought to be the cause of cell aging. Every time a cell divides the telomere becomes a bit shorter; when it is finally worn down, the cell is unable to split and dies.
Telomerase
Telomerase, also called terminal transferase, is a ribonucleoprotein that adds a species-dependent telomere repeat sequence to the 3' end of telomeres. A telomere is a region of repetitive sequences at each end of the chromosomes of most euka ...
is an enzyme which rebuilds the telomeres in stem cells and cancer cells, allowing them to replicate an infinite number of times. No definitive work has yet demonstrated that telomerase can be used in human somatic cells to prevent healthy tissues from aging. On the other hand, scientists hope to be able to grow organs with the help of stem cells, allowing organ transplants without the risk of rejection, another step in extending human life expectancy. These technologies are the subject of ongoing research, and are not yet realized.
Biologically immortal species
Life defined as biologically immortal is still susceptible to causes of death besides aging, including disease and trauma, as defined above. Notable immortal species include:
* ''Bacteria'' – Bacteria reproduce through
binary fission
Binary may refer to:
Science and technology Mathematics
* Binary number, a representation of numbers using only two digits (0 and 1)
* Binary function, a function that takes two arguments
* Binary operation, a mathematical operation that t ...
. A parent bacterium splits itself into two identical daughter cells which eventually then split themselves in half. This process repeats, thus making the bacterium essentially immortal. A 2005
PLoS Biology
''PLOS Biology'' is a monthly peer-reviewed scientific journal covering all aspects of biology. Publication began on October 13, 2003. It is the first journal published by the Public Library of Science. The editor-in-chief is Nonia Pariente.
In ad ...
paper suggests that after each division the daughter cells can be identified as the older and the younger, and the older is slightly smaller, weaker, and more likely to die than the younger.
* ''
Turritopsis dohrnii
''Turritopsis dohrnii'', also known as the immortal jellyfish, is a species of small, biologically immortal jellyfish found worldwide in temperate to tropic waters. It is one of the few known cases of animals capable of reverting completely to ...
'', a jellyfish (phylum
Cnidaria
Cnidaria () is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter.
Their distinguishing feature is cnidocytes, specialized cells that th ...
, class
Hydrozoa
Hydrozoa (hydrozoans; ) are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specializ ...
, order
Anthoathecata
Anthoathecata, or the athecate hydroids, are an order of hydrozoans belonging to the phylum Cnidaria. A profusion of alternate scientific names exists for this long-known, heavily discussed, and spectacular group. It has also been called Gymnobl ...
), after becoming a sexually mature adult, can transform itself back into a polyp using the cell conversion process of
transdifferentiation
Transdifferentiation, also known as lineage reprogramming, is the process in which one mature somatic cell is transformed into another mature somatic cell without undergoing an intermediate pluripotent state or progenitor cell type. It is a type ...
. ''Turritopsis dohrnii'' repeats this cycle, meaning that it may have an
indefinite lifespan
Life extension is the concept of extending the human lifespan, either modestly through improvements in medicine or dramatically by increasing the maximum lifespan beyond its generally-settled limit of 125 years.
Several researchers in the area ...
. Its immortal adaptation has allowed it to spread from its original habitat in the Caribbean to "all over the world".
* '' Hydra'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
belonging to the phylum
Cnidaria
Cnidaria () is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter.
Their distinguishing feature is cnidocytes, specialized cells that th ...
, the class
Hydrozoa
Hydrozoa (hydrozoans; ) are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specializ ...
and the order
Anthomedusae
Anthoathecata, or the athecate hydroids, are an order of hydrozoans belonging to the phylum Cnidaria. A profusion of alternate scientific names exists for this long-known, heavily discussed, and spectacular group. It has also been called Gymnobl ...
. They are simple fresh-water
predatory
Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill th ...
animals possessing
radial symmetry
Symmetry in biology refers to the symmetry observed in organisms, including plants, animals, fungi, and bacteria. External symmetry can be easily seen by just looking at an organism. For example, take the face of a human being which has a pla ...
.
* ''
Bristlecone pine
The term bristlecone pine covers three species of pine tree (family Pinaceae, genus ''Pinus
A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. T ...
s'' are speculated to be potentially immortal; the oldest known living specimen is over 5,000 years old.
Evolution of aging
As the existence of biologically immortal species demonstrates, there is no
thermodynamic
Thermodynamics is a branch of physics that deals with heat, work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quantities is governed by the four laws of ther ...
necessity for senescence: a defining feature of life is that it takes in free energy from the environment and unloads its
entropy
Entropy is a scientific concept, as well as a measurable physical property, that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodynam ...
as waste. Living systems can even build themselves up from seed, and routinely repair themselves. Aging is therefore presumed to be a byproduct of
evolution
Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation ...
, but why mortality should be selected for remains a subject of research and debate. Programmed cell death and the telomere "end replication problem" are found even in the earliest and simplest of organisms. This may be a tradeoff between selecting for cancer and selecting for aging.
Modern theories on the evolution of aging include the following:
* Mutation accumulation is a theory formulated by
Peter Medawar
Sir Peter Brian Medawar (; 28 February 1915 – 2 October 1987) was a Brazilian-British biologist and writer, whose works on graft rejection and the discovery of acquired immune tolerance have been fundamental to the medical practice of tissue ...
in 1952 to explain how evolution would select for aging. Essentially, aging is never selected against, as organisms have offspring before the mortal mutations surface in an individual.
* Antagonistic pleiotropy is a theory proposed as an alternative by George C. Williams, a critic of Medawar, in 1957. In antagonistic pleiotropy, genes carry effects that are both beneficial and detrimental. In essence this refers to genes that offer benefits early in life, but exact a cost later on, i.e. decline and death.
* The disposable soma theory was proposed in 1977 by Thomas Kirkwood, which states that an individual body must allocate energy for metabolism, reproduction, and maintenance, and must compromise when there is food scarcity. Compromise in allocating energy to the repair function is what causes the body gradually to deteriorate with age, according to Kirkwood.
Immortality of the germ line
Individual organisms ordinarily age and die, while the germlines which connect successive generations are potentially immortal. The basis for this difference is a fundamental problem in biology. The Russian biologist and historian
Zhores A. Medvedev
Zhores Aleksandrovich Medvedev (russian: Жоре́с Алекса́ндрович Медве́дев; 14 November 1925 – 15 November 2018) was a Russian agronomist, biologist, historian and dissident. His twin brother is the historian Roy Medv ...
considered that the accuracy of
genome
In the fields of molecular biology and genetics, a genome is all the genetic information of an organism. It consists of nucleotide sequences of DNA (or RNA in RNA viruses). The nuclear genome includes protein-coding genes and non-coding ge ...
replicative and other synthetic systems alone cannot explain the immortality of
germ line
In biology and genetics, the germline is the population of a multicellular organism's cells that pass on their genetic material to the progeny (offspring). In other words, they are the cells that form the egg, sperm and the fertilised egg. They ...
s. Rather Medvedev thought that known features of the biochemistry and genetics of
sexual reproduction
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete ( haploid reproductive cells, such as a sperm or egg cell) with a single set of chromosomes combines with another gamete to produce a zygote tha ...
indicate the presence of unique information maintenance and restoration processes at the different stages of
gametogenesis
Gametogenesis is a biological process by which diploid or haploid precursor cells undergo cell division and differentiation to form mature haploid gametes. Depending on the biological life cycle of the organism, gametogenesis occurs by meiotic d ...
. In particular, Medvedev considered that the most important opportunities for information maintenance of
germ cell
Germ or germs may refer to:
Science
* Germ (microorganism), an informal word for a pathogen
* Germ cell, cell that gives rise to the gametes of an organism that reproduces sexually
* Germ layer, a primary layer of cells that forms during embry ...
DNA repair
DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. In human cells, both normal metabolic activities and environmental factors such as radiation can cause DNA dam ...
; he saw these as processes within the germ cells that were capable of restoring the integrity of DNA and
chromosome
A chromosome is a long DNA molecule with part or all of the genetic material of an organism. In most chromosomes the very long thin DNA fibers are coated with packaging proteins; in eukaryotic cells the most important of these proteins are ...
s from the types of damage that cause irreversible aging in
somatic cell
A somatic cell (from Ancient Greek σῶμα ''sôma'', meaning "body"), or vegetal cell, is any biological cell forming the body of a multicellular organism other than a gamete, germ cell, gametocyte or undifferentiated stem cell. Such cells compo ...
s.
Prospects for human biological immortality
Life-extending substances
Some scientists believe that boosting the amount or proportion of
telomerase
Telomerase, also called terminal transferase, is a ribonucleoprotein that adds a species-dependent telomere repeat sequence to the 3' end of telomeres. A telomere is a region of repetitive sequences at each end of the chromosomes of most euka ...
in the body, a naturally forming enzyme that helps maintain the protective caps at the ends of
chromosome
A chromosome is a long DNA molecule with part or all of the genetic material of an organism. In most chromosomes the very long thin DNA fibers are coated with packaging proteins; in eukaryotic cells the most important of these proteins are ...
s, could prevent cells from dying and so may ultimately lead to extended, healthier lifespans. A team of researchers at the Spanish National Cancer Centre (
Madrid
Madrid ( , ) is the capital and most populous city of Spain. The city has almost 3.4 million inhabitants and a metropolitan area population of approximately 6.7 million. It is the second-largest city in the European Union (EU), and ...
) tested the hypothesis on mice. It was found that those mice which were "
genetically engineered
Genetic engineering, also called genetic modification or genetic manipulation, is the modification and manipulation of an organism's genes using technology. It is a set of technologies used to change the genetic makeup of cells, including t ...
to produce 10 times the normal levels of telomerase lived 50% longer than normal mice".
In normal circumstances, without the presence of telomerase, if a cell divides repeatedly, at some point all the progeny will reach their Hayflick limit. With the presence of telomerase, each dividing cell can replace the lost bit of DNA, and any single cell can then divide unbounded. While this unbounded growth property has excited many researchers, caution is warranted in exploiting this property, as exactly this same unbounded growth is a crucial step in enabling cancerous growth. If an organism can replicate its body cells faster, then it would theoretically stop aging.
Embryonic stem cells
Embryonic stem cells (ESCs) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage pre- implantation embryo. Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they co ...
express telomerase, which allows them to divide repeatedly and form the individual. In adults, telomerase is highly expressed in cells that need to divide regularly (e.g., in the immune system), whereas most
somatic
Somatic may refer to:
* Somatic (biology), referring to the cells of the body in contrast to the germ line cells
** Somatic cell, a non-gametic cell in a multicellular organism
* Somatic nervous system, the portion of the vertebrate nervous sys ...
cells express it only at very low levels in a cell-cycle dependent manner.
Technological immortality, biological machines, and "swallowing the doctor"
Technological immortality is the prospect for much longer life spans made possible by scientific advances in a variety of fields: nanotechnology, emergency room procedures, genetics,
biological engineering
Biological engineering or
bioengineering is the application of principles of biology and the tools of engineering to create usable, tangible, economically-viable products. Biological engineering employs knowledge and expertise from a number o ...
,
regenerative medicine
Regenerative medicine deals with the "process of replacing, engineering or regenerating human or animal cells, tissues or organs to restore or establish normal function". This field holds the promise of engineering damaged tissues and organs by st ...
,
microbiology
Microbiology () is the scientific study of microorganisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). Microbiology encompasses numerous sub-disciplines including virology, bacteriology, prot ...
, and others. Contemporary life spans in the advanced industrial societies are already markedly longer than those of the past because of better nutrition, availability of health care, standard of living and bio-medical scientific advances. Technological immortality predicts further progress for the same reasons over the near term. An important aspect of current scientific thinking about immortality is that some combination of
human cloning
Human cloning is the creation of a genetically identical copy (or clone) of a human. The term is generally used to refer to artificial human cloning, which is the reproduction of human cells and tissue. It does not refer to the natural concepti ...
, cryonics or nanotechnology will play an essential role in extreme life extension.
Robert Freitas
Robert A. Freitas Jr. (born 1952) is an American nanotechnologist.
Career
In 1974, Freitas earned a bachelor's degree in both physics and psychology from Harvey Mudd College, and in 1978, he received a Juris Doctor (J.D.) degree from Santa Clara U ...
, a nanorobotics theorist, suggests tiny medical
nanorobot
Nanoid robotics, or for short, nanorobotics or nanobotics, is an emerging technology field creating machines or robots whose components are at or near the scale of a nanometer (10−9 meters). More specifically, nanorobotics (as opposed to mic ...
s could be created to go through human bloodstreams, find dangerous things like cancer cells and bacteria, and destroy them. Freitas anticipates that gene-therapies and nanotechnology will eventually make the human body effectively self-sustainable and capable of living indefinitely in empty space, short of severe brain trauma. This supports the theory that we will be able to continually create biological or synthetic replacement parts to replace damaged or dying ones. Future advances in
nanomedicine
Nanomedicine is the medical application of nanotechnology. Nanomedicine ranges from the medical applications of nanomaterials and BioBrick, biological devices, to Nanoelectronics, nanoelectronic biosensors, and even possible future applicatio ...
could give rise to
life extension
Life extension is the concept of extending the human life expectancy, lifespan, either modestly through improvements in medicine or dramatically by increasing the maximum lifespan beyond its generally-settled oldest people, limit of 125 years.
S ...
through the repair of many processes thought to be responsible for aging.
K. Eric Drexler
Kim Eric Drexler (born April 25, 1955) is an American engineer best known for studies of the potential of molecular nanotechnology (MNT), from the 1970s and 1980s. His 1991 doctoral thesis at Massachusetts Institute of Technology was revised and ...
, one of the founders of
nanotechnology
Nanotechnology, also shortened to nanotech, is the use of matter on an atomic, molecular, and supramolecular scale for industrial purposes. The earliest, widespread description of nanotechnology referred to the particular technological goal o ...
, postulated cell repair devices, including ones operating within cells and using as yet hypothetical
biological machine
A molecular machine, nanite, or nanomachine is a molecular component that produces quasi-mechanical movements (output) in response to specific stimuli (input). In cellular biology, macromolecular machines frequently perform tasks essential for l ...
s, in his 1986 book
Engines of Creation
''Engines of Creation: The Coming Era of Nanotechnology'' is a 1986 molecular nanotechnology book written by K. Eric Drexler with a foreword by Marvin Minsky. An updated version was released in 2007. The book has been translated into Japanese, F ...
.
Raymond Kurzweil
Raymond Kurzweil ( ; born February 12, 1948) is an American computer scientist, author, inventor, and futurist. He is involved in fields such as optical character recognition (OCR), text-to-speech synthesis, speech recognition technology, and e ...
, a
futurist
Futurists (also known as futurologists, prospectivists, foresight practitioners and horizon scanners) are people whose specialty or interest is futurology or the attempt to systematically explore predictions and possibilities abou ...
and
transhumanist
Transhumanism is a philosophical and intellectual movement which advocates the enhancement of the human condition by developing and making widely available sophisticated technologies that can greatly enhance longevity and cognition.
Transhuma ...
nanorobotics
Nanoid robotics, or for short, nanorobotics or nanobotics, is an emerging technology field creating machines or robots whose components are at or near the scale of a nanometer (10−9 meters). More specifically, nanorobotics (as opposed to mic ...
could completely remedy the effects of aging by 2030. According to
Richard Feynman
Richard Phillips Feynman (; May 11, 1918 – February 15, 1988) was an American theoretical physicist, known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, the physics of the superflu ...
, it was his former graduate student and collaborator
Albert Hibbs
Albert Roach Hibbs (October 19, 1924 – February 24, 2003) was an American mathematician and physicist affiliated with the Jet Propulsion Laboratory (JPL). He was known as "The Voice of JPL" due to his gift for explaining advanced science i ...
who originally suggested to him (circa 1959) the idea of a ''medical'' use for Feynman's theoretical micromachines (see
biological machine
A molecular machine, nanite, or nanomachine is a molecular component that produces quasi-mechanical movements (output) in response to specific stimuli (input). In cellular biology, macromolecular machines frequently perform tasks essential for l ...
). Hibbs suggested that certain repair machines might one day be reduced in size to the point that it would, in theory, be possible to (as Feynman put it) "swallow the doctor". The idea was incorporated into Feynman's 1959 essay ''
There's Plenty of Room at the Bottom
"There's Plenty of Room at the Bottom: An Invitation to Enter a New Field of Physics" was a lecture given by physicist Richard Feynman at the annual American Physical Society meeting at Caltech on December 29, 1959. Feynman considered the possibi ...
.''
Cryonics
Cryonics
Cryonics (from el, κρύος ''kryos'' meaning 'cold') is the low-temperature freezing (usually at ) and storage of human remains, with the speculative hope that resurrection may be possible in the future. Cryonics is regarded with skepticis ...
, the practice of preserving organisms (either intact specimens or only their brains) for possible future revival by storing them at cryogenic temperatures where metabolism and decay are almost completely stopped, can be used to 'pause' for those who believe that life extension technologies will not develop sufficiently within their lifetime. Ideally, cryonics would allow clinically dead people to be brought back in the future after cures to the patients' diseases have been discovered and aging is reversible. Modern cryonics procedures use a process called
vitrification
Vitrification (from Latin ''vitreum'', "glass" via French ''vitrifier'') is the full or partial transformation of a substance into a glass, that is to say, a non-crystalline amorphous solid. Glasses differ from liquids structurally and glasses po ...
which creates a glass-like state rather than
freezing
Freezing is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point. In accordance with the internationally established definition, freezing means the solidification phase change of a liquid o ...
as the body is brought to low temperatures. This process reduces the risk of ice crystals damaging the cell-structure, which would be especially detrimental to cell structures in the brain, as their minute adjustment evokes the individual's mind.
Mind-to-computer uploading
One idea that has been advanced involves
uploading
Uploading refers to ''transmitting'' data from one computer system to another through means of a network. Common methods of uploading include: uploading via web browsers, FTP clients], and computer terminal, terminals ( SCP/ SFTP). Uploading ...
an individual's habits and memories via
direct mind-computer interface
Direct may refer to:
Mathematics
* Directed set, in order theory
* Direct limit of (pre), sheaves
* Direct sum of modules, a construction in abstract algebra which combines several vector spaces
Computing
* Direct access (disambiguation), a ...
. The individual's memory may be loaded to a computer or to a new organic body. Extropian
futurists
Futurists (also known as futurologists, prospectivists, foresight practitioners and horizon scanners) are people whose specialty or interest is futurology or the attempt to systematically explore predictions and possibilities abou ...
like Moravec and Kurzweil have proposed that, thanks to exponentially growing computing power, it will someday be possible to upload human consciousness onto a computer system, and exist indefinitely in a virtual environment.
This could be accomplished via advanced cybernetics, where computer hardware would initially be installed in the brain to help sort memory or accelerate thought processes. Components would be added gradually until the person's entire brain functions were handled by artificial devices, avoiding sharp transitions that would lead to issues of
identity
Identity may refer to:
* Identity document
* Identity (philosophy)
* Identity (social science)
* Identity (mathematics)
Arts and entertainment Film and television
* ''Identity'' (1987 film), an Iranian film
* ''Identity'' (2003 film), ...
, thus running the risk of the person to be declared dead and thus not be a legitimate owner of his or her property. After this point, the human body could be treated as an optional accessory and the program implementing the person could be transferred to any sufficiently powerful computer.
Another possible mechanism for mind upload is to perform a detailed scan of an individual's original, organic brain and simulate the entire structure in a computer. What level of detail such scans and simulations would need to achieve to emulate awareness, and whether the scanning process would destroy the brain, is still to be determined.
It is suggested that achieving immortality through this mechanism would require specific consideration to be given to the role of
consciousness
Consciousness, at its simplest, is sentience and awareness of internal and external existence. However, the lack of definitions has led to millennia of analyses, explanations and debates by philosophers, theologians, linguisticians, and scien ...
in the functions of the
mind
The mind is the set of faculties responsible for all mental phenomena. Often the term is also identified with the phenomena themselves. These faculties include thought, imagination, memory, will, and sensation. They are responsible for various m ...
. An uploaded mind would only be a copy of the original mind, and not the conscious mind of the living entity associated in such a transfer. Without a simultaneous upload of consciousness, the original living entity remains mortal, thus not achieving true immortality.
Research on
neural correlates of consciousness
The neural correlates of consciousness (NCC) refer to the relationships between mental states and neural states and constitute the minimal set of neuronal events and mechanisms sufficient for a specific conscious percept. Neuroscientists use empi ...
is yet inconclusive on this issue. Whatever the route to mind upload, persons in this state could then be considered essentially immortal, short of loss or traumatic destruction of the machines that maintained them.
Cybernetics
Transforming a human into a
cyborg
A cyborg ()—a portmanteau of ''cybernetic'' and ''organism''—is a being with both organic and biomechatronic body parts. The term was coined in 1960 by Manfred Clynes and Nathan S. Kline.
can include
brain implants
Brain implants, often referred to as neural implants, are technological devices that connect directly to a biological subject's brain – usually placed on the surface of the brain, or attached to the brain's cortex. A common purpose of modern bra ...
or extracting a human processing unit and placing it in a robotic life-support system. Even replacing biological organs with robotic ones could increase life span (e.g. pace makers) and depending on the definition, many technological upgrades to the body, like genetic modifications or the addition of nanobots would qualify an individual as a cyborg. Some people believe that such modifications would make one impervious to aging and disease and theoretically immortal unless killed or destroyed.
Digital immortality
Religious views
As late as 1952, the editorial staff of the ''
Syntopicon
''A Syntopicon: An Index to The Great Ideas'' (1952; second edition, 1990) is a two-volume index, published as volumes 2 and 3 of Encyclopædia Britannica, Inc.’s collection ''Great Books of the Western World''. Compiled by Mortimer J. Adler, a ...
'' found in their compilation of the
Great Books of the Western World
''Great Books of the Western World'' is a series of books originally published in the United States in 1952, by Encyclopædia Britannica, Inc., to present the great books in a 54-volume set.
The original editors had three criteria for includi ...
, that "The philosophical issue concerning immortality cannot be separated from issues concerning the existence and nature of man's soul." Thus, the vast majority of speculation on immortality before the 21st century was regarding the nature of the afterlife.
Ancient Greek religion
Immortality in
ancient Greek religion
Religious practices in ancient Greece encompassed a collection of beliefs, rituals, and mythology, in the form of both popular public religion and cult practices. The application of the modern concept of "religion" to ancient cultures has been ...
originally always included an eternal union of body and soul as can be seen in
Homer
Homer (; grc, Ὅμηρος , ''Hómēros'') (born ) was a Greek poet who is credited as the author of the ''Iliad'' and the ''Odyssey'', two epic poems that are foundational works of ancient Greek literature. Homer is considered one of the ...
,
Hesiod
Hesiod (; grc-gre, Ἡσίοδος ''Hēsíodos'') was an ancient Greek poet generally thought to have been active between 750 and 650 BC, around the same time as Homer. He is generally regarded by western authors as 'the first written poet i ...
, and various other ancient texts. The soul was considered to have an eternal existence in Hades, but without the body the soul was considered dead. Although almost everybody had nothing to look forward to but an eternal existence as a disembodied dead soul, a number of men and women were considered to have gained physical immortality and been brought to live forever in either
Elysium
Elysium (, ), otherwise known as the Elysian Fields ( grc, Ἠλύσιον πεδίον, ''Ēlýsion pedíon'') or Elysian Plains, is a conception of the afterlife that developed over time and was maintained by some Greek religious and philos ...
, the Islands of the Blessed, heaven, the ocean or literally right under the ground.
Among those humans made immortal were
Amphiaraus
In Greek mythology, Amphiaraus or Amphiaraos (; Ancient Greek: Ἀμφιάραος, Ἀμφιάρεως, "very sacred") was the son of Oicles, a seer, and one of the leaders of the Seven against Thebes. Amphiaraus at first refused to go with Adra ...
Iphigenia
In Greek mythology, Iphigenia (; grc, Ἰφιγένεια, , ) was a daughter of King Agamemnon and Queen Clytemnestra, and thus a princess of Mycenae.
In the story, Agamemnon offends the goddess Artemis on his way to the Trojan War by hunting ...
,
Menelaus
In Greek mythology, Menelaus (; grc-gre, Μενέλαος , 'wrath of the people', ) was a king of Mycenaean (pre- Dorian) Sparta. According to the ''Iliad'', Menelaus was a central figure in the Trojan War, leading the Spartan contingent of th ...
,
Peleus
In Greek mythology, Peleus (; Ancient Greek: Πηλεύς ''Pēleus'') was a hero, king of Phthia, husband of Thetis and the father of their son Achilles. This myth was already known to the hearers of Homer in the late 8th century BC.
Biograp ...
, and a great number of those who fought in the Trojan and Theban wars.
Some were considered to have died and been resurrected before they achieved physical immortality.
Asclepius
Asclepius (; grc-gre, Ἀσκληπιός ''Asklēpiós'' ; la, Aesculapius) is a hero and god of medicine in ancient Religion in ancient Greece, Greek religion and Greek mythology, mythology. He is the son of Apollo and Coronis (lover of ...
was killed by Zeus only to be resurrected and transformed into a major deity. In some versions of the
Trojan War
In Greek mythology, the Trojan War was waged against the city of Troy by the Achaeans (Greeks) after Paris of Troy took Helen from her husband Menelaus, king of Sparta. The war is one of the most important events in Greek mythology and has ...
myth,
Achilles
In Greek mythology, Achilles ( ) or Achilleus ( grc-gre, Ἀχιλλεύς) was a hero of the Trojan War, the greatest of all the Greek warriors, and the central character of Homer's ''Iliad''. He was the son of the Nereid Thetis and Peleus, k ...
, after being killed, was snatched from his funeral pyre by his divine mother
Thetis
Thetis (; grc-gre, Θέτις ), is a figure from Greek mythology with varying mythological roles. She mainly appears as a sea nymph, a goddess of water, or one of the 50 Nereids, daughters of the ancient sea god Nereus.
When described as ...
, resurrected, and brought to an immortal existence in either Leuce, the Elysian plains, or the Islands of the Blessed.
Memnon
In Greek mythology, Memnon (; Ancient Greek: Μέμνων means 'resolute') was a king of Aethiopia and son of Tithonus and Eos. As a warrior he was considered to be almost Achilles' equal in skill. During the Trojan War, he brought an army t ...
, who was killed by Achilles, seems to have received a similar fate.
Alcmene
In Greek mythology, Alcmene () or Alcmena (; Ancient Greek: Ἀλκμήνη or Doric Greek: Ἀλκμάνα, Latin: Alcumena means "strong in wrath") was the wife of Amphitryon by whom she bore two children, Iphicles and Laonome. She is best known ...
Heracles
Heracles ( ; grc-gre, Ἡρακλῆς, , glory/fame of Hera), born Alcaeus (, ''Alkaios'') or Alcides (, ''Alkeidēs''), was a divine hero in Greek mythology, the son of Zeus and Alcmene, and the foster son of Amphitryon.By his adoptive ...
, and
Melicertes
In Greek mythology, Melicertes ( grc, Μελικέρτης, Melikértēs, sometimes Melecertes), later called Palaemon or Palaimon (), was a Boeotian prince as the son of King Athamas and Ino, daughter of King Cadmus of Thebes. He was the brot ...
were also among the figures sometimes considered to have been resurrected to physical immortality. According to
Herodotus' Histories
The ''Histories'' ( el, Ἱστορίαι, ; also known as ''The History'') of Herodotus is considered the founding work of history in Western literature. Written around 430 BC in the Ionic dialect of classical Greek, ''The Histories'' ser ...
, the 7th century BCE sage
Aristeas of Proconnesus
Aristeas ( el, Ἀριστέας) was a semi-legendary Greek poet and miracle-worker, a native of Proconnesus in Asia Minor, active ca. 7th century BC. The Suda claims that, whenever he wished, his soul could leave his body and return again. ...
was first found dead, after which his body disappeared from a locked room. Later he was found not only to have been resurrected but to have gained immortality.
The parallel between these traditional beliefs and the later resurrection of Jesus was not lost on early Christians, as
Justin Martyr
Justin Martyr ( el, Ἰουστῖνος ὁ μάρτυς, Ioustinos ho martys; c. AD 100 – c. AD 165), also known as Justin the Philosopher, was an early Christian apologist and philosopher.
Most of his works are lost, but two apologies and ...
argued:
: "when we say ... Jesus Christ, our teacher, was crucified and died, and rose again, and ascended into heaven, we propose nothing different from what you believe regarding those whom you consider sons of Zeus."
The philosophical idea of an immortal soul was a belief first appearing with either Pherecydes or the
Orphics
Orphism (more rarely Orphicism; grc, Ὀρφικά, Orphiká) is the name given to a set of religious beliefs and practices originating in the ancient Greek and Hellenistic world, associated with literature ascribed to the mythical poet Orpheus ...
, and most importantly advocated by
Plato
Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was a Greek philosopher born in Athens during the Classical period in Ancient Greece. He founded the Platonist school of thought and the Academy, the first institution ...
and his followers. This, however, never became the general norm in Hellenistic thought. As may be witnessed even into the Christian era, not least by the complaints of various philosophers over popular beliefs, many or perhaps most traditional Greeks maintained the conviction that certain individuals were resurrected from the dead and made physically immortal and that others could only look forward to an existence as disembodied and dead, though everlasting, souls.
Buddhism
One of the three marks of existence in Buddhism is
anattā
In Buddhism, the term ''anattā'' (Pali: अनत्ता) or ''anātman'' (Sanskrit: अनात्मन्) refers to the doctrine of "non-self" – that no unchanging, permanent self or essence can be found in any phenomenon. While often ...
, "non-self". This teaching states that the body does not have an eternal soul but is composed of five
skandhas
(Sanskrit) or ( Pāḷi) means "heaps, aggregates, collections, groupings". In Buddhism, it refers to the five aggregates of clinging (), the five material and mental factors that take part in the rise of craving and clinging. They are als ...
or aggregates. Additionally, another mark of existence is impermanence, also called
anicca
Impermanence, also known as the philosophical problem of change, is a philosophical concept addressed in a variety of religions and philosophies. In Eastern philosophy it is notable for its role in the Buddhist three marks of existence. It is ...
, which runs directly counter to concepts of immortality or permanence. According to one
Tibetan Buddhist
Tibetan Buddhism (also referred to as Indo-Tibetan Buddhism, Lamaism, Lamaistic Buddhism, Himalayan Buddhism, and Northern Buddhism) is the form of Buddhism practiced in Tibet and Bhutan, where it is the dominant religion. It is also in majo ...
teaching,
Dzogchen
Dzogchen (, "Great Perfection" or "Great Completion"), also known as ''atiyoga'' ( utmost yoga), is a tradition of teachings in Indo-Tibetan Buddhism and Yungdrung Bon aimed at discovering and continuing in the ultimate ground of existence. ...
, individuals can transform the physical body into an immortal
body of light
The body of light, sometimes called the 'astral body' or the 'subtle body,' is a "quasi material" aspect of the human body, being neither solely physical nor solely spiritual, posited by a number of philosophers, and elaborated on according to ...
called the
rainbow body
In Dzogchen, rainbow body
(, Jalü or Jalus) is a level of realization. This may or may not be accompanied by the 'rainbow body phenomenon'. The rainbow body phenomenon is pre-Buddhist in origin, and is a topic which has been treated fairly serio ...
.
Christianity
Christian theology
Christian theology is the theology of Christianity, Christian belief and practice. Such study concentrates primarily upon the texts of the Old Testament and of the New Testament, as well as on Christian tradition. Christian theology, theologian ...
holds that
Adam and Eve
Adam and Eve, according to the creation myth of the Abrahamic religions, were the first man and woman. They are central to the belief that humanity is in essence a single family, with everyone descended from a single pair of original ancestors. ...
lost physical immortality for themselves and all their descendants in the
Fall of man
The fall of man, the fall of Adam, or simply the Fall, is a term used in Christianity to describe the transition of the first man and woman from a state of innocent obedience to God in Christianity, God to a state of guilty disobedience.
*
*
*
* ...
, although this initial "imperishability of the bodily frame of man" was "a preternatural condition".
Christians who profess the
Nicene Creed
The original Nicene Creed (; grc-gre, Σύμβολον τῆς Νικαίας; la, Symbolum Nicaenum) was first adopted at the First Council of Nicaea in 325. In 381, it was amended at the First Council of Constantinople. The amended form is a ...
believe that every dead person (whether they believed in Christ or not) will be resurrected from the dead at the
Second Coming
The Second Coming (sometimes called the Second Advent or the Parousia) is a Christian (as well as Islamic and Baha'i) belief that Jesus will return again after his ascension to heaven about two thousand years ago. The idea is based on messi ...
, and this belief is known as
Universal resurrection
General resurrection or universal resurrection is the belief in a resurrection of the dead, or resurrection from the dead ( Koine: , ''anastasis onnekron''; literally: "standing up again of the dead") by which most or all people who have died ...
. While
Paul the Apostle
Paul; grc, Παῦλος, translit=Paulos; cop, ⲡⲁⲩⲗⲟⲥ; hbo, פאולוס השליח (previously called Saul of Tarsus;; ar, بولس الطرسوسي; grc, Σαῦλος Ταρσεύς, Saũlos Tarseús; tr, Tarsuslu Pavlus; ...
insisted that the resurrected body was only "spiritual" and that "flesh and blood cannot inherit the kingdom of God"., the Gospels increasingly emphasized the physical nature of the resurrection body – as the resurrected Jesus in the
Gospel of Luke
The Gospel of Luke), or simply Luke (which is also its most common form of abbreviation). tells of the origins, birth, ministry, death, resurrection, and ascension of Jesus Christ. Together with the Acts of the Apostles, it makes up a two-volu ...
insisting on his still consisting of "flesh and bones". This shift may have been in response to traditional Greek expectations that immortality always included both body and soul.
N.T. Wright, a theologian and former
Bishop of Durham
The Bishop of Durham is the Anglican bishop responsible for the Diocese of Durham in the Province of York. The diocese is one of the oldest in England and its bishop is a member of the House of Lords. Paul Butler has been the Bishop of Durham ...
, has said many people forget the physical aspect of what Jesus promised. He told
Time
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future. It is a component quantity of various measurements used to sequence events, to ...
: "Jesus' resurrection marks the beginning of a restoration that he will complete upon his return. Part of this will be the resurrection of all the dead, who will 'awake', be embodied and participate in the renewal. Wright says
John Polkinghorne
John Charlton Polkinghorne (16 October 1930 – 9 March 2021) was an English theoretical physicist, theologian, and Anglican priest. A prominent and leading voice explaining the relationship between science and religion, he was professor of ma ...
, a physicist and a priest, has put it this way: 'God will download our software onto his hardware until the time he gives us new hardware to run the software again for ourselves.' That gets to two things nicely: that the period after death (the
Intermediate state
In some forms of Christianity the intermediate state or interim state is a person's existence between death and the universal resurrection. In addition, there are beliefs in a particular judgment right after death and a general judgment or last ...
) is a period when we are in God's presence but not active in our own bodies, and also that the more important transformation will be when we are again embodied and administering Christ's kingdom." This kingdom will consist of Heaven and Earth "joined together in a new creation", he said.
Christian apocrypha include immortal human figures such as
Cartaphilus
The Wandering Jew is a mythical immortal man whose legend began to spread in Europe in the 13th century. In the original legend, a Jew who taunted Jesus on the way to the Crucifixion was then cursed to walk the Earth until the Second Coming. Th ...
and
Longinus
Longinus () is the name given to the unnamed Roman soldier who pierced the side of Jesus with a lance and who in medieval and some modern Christian traditions is described as a convert to Christianity. His name first appeared in the apocryphal G ...
who were cursed with physical immortality for various transgressions against Christ during the Passion.
Hinduism
Hindus
Hindus (; ) are people who religiously adhere to Hinduism.Jeffery D. Long (2007), A Vision for Hinduism, IB Tauris, , pages 35–37 Historically, the term has also been used as a geographical, cultural, and later religious identifier for ...
believe in an immortal soul which is reincarnated after death. According to Hinduism, people repeat a process of life, death, and rebirth in a cycle called '' samsara''. If they live their life well, their ''
karma
Karma (; sa, कर्म}, ; pi, kamma, italic=yes) in Sanskrit means an action, work, or deed, and its effect or consequences. In Indian religions, the term more specifically refers to a principle of cause and effect, often descriptivel ...
'' improves and their station in the next life will be higher, and conversely lower if they live their life poorly. After many life times of perfecting its karma, the soul is freed from the cycle and lives in perpetual bliss. There is no place of eternal torment in Hinduism, although if a soul consistently lives very evil lives, it could work its way down to the very bottom of the cycle.
There are explicit renderings in the
Upanishad
The Upanishads (; sa, उपनिषद् ) are late Vedic Sanskrit texts that supplied the basis of later Hindu philosophy.Wendy Doniger (1990), ''Textual Sources for the Study of Hinduism'', 1st Edition, University of Chicago Press, , ...
s alluding to a physically immortal state brought about by purification, and sublimation of the 5 elements that make up the body. For example, in the
Shvetashvatara Upanishad
The ''Shvetashvatara Upanishad'' ( sa, श्वेताश्वतरोपनिषद् or or , IAST: ' or ') is an ancient Sanskrit text embedded in the Yajurveda. It is listed as number 14 in the Muktika canon of 108 Upanishads. The Upa ...
(Chapter 2, Verse 12), it is stated "When earth, water, fire, air and sky arise, that is to say, when the five attributes of the elements, mentioned in the books on yoga, become manifest then the yogi's body becomes purified by the fire of yoga and he is free from illness, old age and death."
Another view of immortality is traced to the Vedic tradition by the interpretation of
Maharishi Mahesh Yogi
Maharishi Mahesh Yogi (born Mahesh Prasad Varma, 12 January 1918
:
That man indeed whom these (contacts) do not disturb, who is even-minded in pleasure and pain, steadfast, he is fit for immortality, O best of men.Maharishi Mahesh Yogi on the Bhagavad-Gita, a New Translation and Commentary, Chapter 1–6. Penguin Books, 1969, pp. 94–95 (v 15)
To Maharishi Mahesh Yogi, the verse means, "Once a man has become established in the understanding of the permanent reality of life, his mind rises above the influence of pleasure and pain. Such an unshakable man passes beyond the influence of death and in the permanent phase of life: he attains eternal life ... A man established in the understanding of the unlimited abundance of absolute existence is naturally free from existence of the relative order. This is what gives him the status of immortal life."
An Indian Tamil saint known as
Vallalar
Thiruvarutprakasa Vallalār Chidambaram Ramalingam (5 October 1823 – 30 January 1874), commonly known in India and across the world as Vallalār, Ramalinga Swamigal and Ramalinga Adigal, was one of the most famous Tamil Saints and also one of t ...
claimed to have achieved immortality before disappearing forever from a locked room in 1874.
Judaism
The traditional concept of an immaterial and immortal soul distinct from the body was not found in Judaism before the
Babylonian exile
The Babylonian captivity or Babylonian exile is the period in Jewish history during which a large number of Judeans from the ancient Kingdom of Judah were captives in Babylon, the capital city of the Neo-Babylonian Empire, following their defeat ...
, but developed as a result of interaction with
Persian
Persian may refer to:
* People and things from Iran, historically called ''Persia'' in the English language
** Persians, the majority ethnic group in Iran, not to be conflated with the Iranic peoples
** Persian language, an Iranian language of the ...
nephesh
Nephesh ( ''nép̄eš'') is a Biblical Hebrew word which occurs in the Hebrew Bible. The word refers to the aspects of sentience, and human beings and other animals are both described as being nephesh. Plants, as an example of live organisms, are ...
'', although translated as ''"soul"'' in some older English-language Bibles, actually has a meaning closer to "living being". ''Nephesh'' was rendered in the
Septuagint
The Greek Old Testament, or Septuagint (, ; from the la, septuaginta, lit=seventy; often abbreviated ''70''; in Roman numerals, LXX), is the earliest extant Greek translation of books from the Hebrew Bible. It includes several books beyond th ...
as (''psūchê''), the Greek word for ‘soul’.
The only Hebrew word traditionally translated "soul" (''nephesh'') in English language Bibles refers to a living, breathing conscious body, rather than to an immortal soul.
In the New Testament, the Greek word traditionally translated "soul" () has substantially the same meaning as the Hebrew, without reference to an immortal soul.
''"Soul"'' may refer either to the whole person, the self, as in "three thousand ''souls''" were converted in (see ).
The
Hebrew Bible
The Hebrew Bible or Tanakh (;"Tanach" ''Random House Webster's Unabridged Dictionary''. Hebrew: ''Tān ...
speaks about ''
Sheol
Sheol ( ; he, ''Šəʾōl'', Tiberian: ''Šŏʾōl'') in the Hebrew Bible is a place of still darkness which lies after death. Although not well defined in the Tanakh, Sheol in this view was a subterranean underworld where the souls of the d ...
'' (שאול), originally a synonym of the grave – the repository of the dead or the cessation of existence, until the
resurrection of the dead
General resurrection or universal resurrection is the belief in a resurrection of the dead, or resurrection from the dead ( Koine: , ''anastasis onnekron''; literally: "standing up again of the dead") by which most or all people who have died ...
. This doctrine of resurrection is mentioned explicitly only in although it may be implied in several other texts. New theories arose concerning Sheol during the
intertestamental period
The intertestamental period (Protestant) or deuterocanonical period (Catholic and Eastern Orthodox) is the period of time between the events of the protocanonical books and the New Testament. Traditionally, it is considered to cover roughly four h ...
.
The views about immortality in Judaism is perhaps best exemplified by the various references to this in
Second Temple period
The Second Temple period in Jewish history lasted approximately 600 years (516 BCE - 70 CE), during which the Second Temple existed. It started with the return to Zion and the construction of the Second Temple, while it ended with the First Jewis ...
. The concept of resurrection of the physical body is found in , according to which it will happen through recreation of the flesh. Resurrection of the dead is specified in detail in the extra-canonical books of
, and in Apocalypse of Baruch. According to the British scholar in ancient Judaism P.R. Davies, there is "little or no clear reference ... either to immortality or to resurrection from the dead" in the
Dead Sea scrolls
The Dead Sea Scrolls (also the Qumran Caves Scrolls) are ancient Jewish and Hebrew religious manuscripts discovered between 1946 and 1956 at the Qumran Caves in what was then Mandatory Palestine, near Ein Feshkha in the West Bank, on the nor ...
texts.
Both
Josephus
Flavius Josephus (; grc-gre, Ἰώσηπος, ; 37 – 100) was a first-century Romano-Jewish historian and military leader, best known for ''The Jewish War'', who was born in Jerusalem—then part of Roman Judea—to a father of priestly d ...
and the
New Testament
The New Testament grc, Ἡ Καινὴ Διαθήκη, transl. ; la, Novum Testamentum. (NT) is the second division of the Christian biblical canon. It discusses the teachings and person of Jesus, as well as events in first-century Christ ...
record that the
Sadducees
The Sadducees (; he, צְדוּקִים, Ṣədūqīm) were a socio-religious sect of Jewish people who were active in Judea during the Second Temple period, from the second century BCE through the destruction of the Temple in 70 CE. Th ...
did not believe in an
afterlife
The afterlife (also referred to as life after death) is a purported existence in which the essential part of an individual's identity or their stream of consciousness continues to live after the death of their physical body. The surviving ess ...
,
but the sources vary on the beliefs of the
Pharisees
The Pharisees (; he, פְּרוּשִׁים, Pərūšīm) were a Jewish social movement and a school of thought in the Levant during the time of Second Temple Judaism. After the destruction of the Second Temple in 70 CE, Pharisaic beliefs bec ...
. The New Testament claims that the Pharisees believed in the resurrection, but does not specify whether this included the flesh or not. According to
Josephus
Flavius Josephus (; grc-gre, Ἰώσηπος, ; 37 – 100) was a first-century Romano-Jewish historian and military leader, best known for ''The Jewish War'', who was born in Jerusalem—then part of Roman Judea—to a father of priestly d ...
, who himself was a Pharisee, the Pharisees held that only the soul was immortal and the souls of good people will be reincarnated and "pass into other bodies," while "the souls of the wicked will suffer eternal punishment."
The
Book of Jubilees
The Book of Jubilees, sometimes called Lesser Genesis (Leptogenesis), is an ancient Jewish religious work of 50 chapters (1,341 verses), considered canonical by the Ethiopian Orthodox Church as well as Beta Israel (Ethiopian Jews), where it is ...
seems to refer to the resurrection of the soul only, or to a more general idea of an immortal soul.
Rabbinic Judaism
Rabbinic Judaism ( he, יהדות רבנית, Yahadut Rabanit), also called Rabbinism, Rabbinicism, or Judaism espoused by the Rabbanites, has been the mainstream form of Judaism since the 6th century CE, after the codification of the Babylonian ...
claims that the righteous dead will be resurrected in the
Messianic Age
In Abrahamic religions, the Messianic Age is the future period of time on Earth in which the messiah will reign and bring universal peace and brotherhood, without any evil. Many believe that there will be such an age; some refer to it as the consu ...
, with the coming of the
messiah
In Abrahamic religions, a messiah or messias (; ,
; ,
; ) is a saviour or liberator of a group of people. The concepts of ''mashiach'', messianism, and of a Messianic Age originated in Judaism, and in the Hebrew Bible, in which a ''mashiach'' ...
. They will then be granted immortality in a perfect world. The wicked dead, on the other hand, will not be resurrected at all. This is not the only Jewish belief about the afterlife. The
Lüshi Chunqiu
The ''Lüshi Chunqiu'', also known in English as ''Master Lü's Spring and Autumn Annals'', is an encyclopedic Chinese classic text compiled around 239 BC under the patronage of the Qin Dynasty Chancellor Lü Buwei. In the evaluation of Michae ...
'' that death is unavoidable.
Henri Maspero
Henri Paul Gaston Maspero (15 December 188317 March 1945) was a French sinologist and professor who contributed to a variety of topics relating to East Asia. Maspero is best known for his pioneering studies of Daoism. He was imprisoned by the Naz ...
noted that many scholarly works frame Taoism as a school of thought focused on the quest for immortality. Isabelle Robinet asserts that Taoism is better understood as a ''way of life'' than as a religion, and that its adherents do not approach or view Taoism the way non-Taoist historians have done. In the Tractate of Actions and their Retributions, a traditional teaching, spiritual immortality can be rewarded to people who do a certain amount of good deeds and live a simple, pure life. A list of good deeds and sins are tallied to determine whether or not a mortal is worthy. Spiritual immortality in this definition allows the soul to leave the earthly realms of afterlife and go to pure realms in the Taoist cosmology.
Zoroastrianism
Zoroastrian
Zoroastrianism is an Iranian religion and one of the world's oldest organized faiths, based on the teachings of the Iranian-speaking prophet Zoroaster. It has a dualistic cosmology of good and evil within the framework of a monotheistic on ...
s believe that on the fourth day after death, the human soul leaves the body and the body remains as an empty shell. Souls would go to either heaven or hell; these concepts of the afterlife in Zoroastrianism may have influenced Abrahamic religions. The Persian word for "immortal" is associated with the month "Amurdad", meaning "deathless" in Persian, in the
Iranian calendar
The Iranian calendars or Iranian chronology ( fa, گاهشماری ایرانی, ) are a succession of calendars invented or used for over two millennia in Iran, also known as Persia. One of the longest chronological records in human history, ...
(near the end of July). The month of Amurdad or
Ameretat
(Avestan: ''𐬀𐬨𐬆𐬭𐬆𐬙𐬁𐬙 '') is the Avestan language name of the Zoroastrian divinity/divine concept of immortality. Amerdad is the Amesha Spenta of long life on earth and perpetuality in the hereafter.
The word ' is grammat ...
is celebrated in Persian culture as ancient Persians believed the "Angel of Immortality" won over the "Angel of Death" in this month.
Philosophical arguments for the immortality of the soul
Alcmaeon of Croton
Alcmaeon of Croton
Alcmaeon of Croton (; el, Ἀλκμαίων ὁ Κροτωνιάτης, ''Alkmaiōn'', ''gen''.: Ἀλκμαίωνος; fl. 5th century BC) was an early Greek medical writer and philosopher-scientist. He has been described as one of the most e ...
argued that the soul is continuously and ceaselessly in motion. The exact form of his argument is unclear, but it appears to have influenced Plato, Aristotle, and other later writers.
Plato
Plato
Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was a Greek philosopher born in Athens during the Classical period in Ancient Greece. He founded the Platonist school of thought and the Academy, the first institution ...
's ''
Phaedo
''Phædo'' or ''Phaedo'' (; el, Φαίδων, ''Phaidōn'' ), also known to ancient readers as ''On The Soul'', is one of the best-known dialogues of Plato's middle period, along with the ''Republic'' and the ''Symposium.'' The philosophical ...
'' advances four arguments for the soul's immortality:
* The Cyclical Argument, or Opposites Argument explains that
Forms
Form is the shape, visual appearance, or configuration of an object. In a wider sense, the form is the way something happens.
Form also refers to:
*Form (document), a document (printed or electronic) with spaces in which to write or enter data
* ...
are eternal and unchanging, and as the soul always brings life, then it must not die, and is necessarily "imperishable". As the body is mortal and is subject to physical death, the soul must be its indestructible opposite. Plato then suggests the analogy of fire and cold. If the form of cold is imperishable, and fire, its opposite, was within close proximity, it would have to withdraw intact as does the soul during death. This could be likened to the idea of the opposite charges of magnets.
* The Theory of Recollection explains that we possess some non-empirical knowledge (e.g. The Form of Equality) at birth, implying the soul existed before birth to carry that knowledge. Another account of the theory is found in Plato's ''
Meno
''Meno'' (; grc-gre, Μένων, ''Ménōn'') is a Socratic dialogue by Plato. Meno begins the dialogue by asking Socrates whether virtue is taught, acquired by practice, or comes by nature. In order to determine whether virtue is teachable ...
'', although in that case Socrates implies anamnesis (previous knowledge of everything) whereas he is not so bold in ''Phaedo''.
* The Affinity Argument, explains that invisible, immortal, and incorporeal things are different from visible, mortal, and corporeal things. Our soul is of the former, while our body is of the latter, so when our bodies die and decay, our soul will continue to live.
* The Argument from Form of Life or The Final Argument explains that the Forms, incorporeal and static entities, are the cause of all things in the world, and all things participate in Forms. For example, beautiful things participate in the Form of Beauty; the number four participates in the Form of the Even, etc. The soul, by its very nature, participates in the Form of Life, which means the soul can never die.
Plotinus
Plotinus
Plotinus (; grc-gre, Πλωτῖνος, ''Plōtînos''; – 270 CE) was a philosopher in the Hellenistic philosophy, Hellenistic tradition, born and raised in Roman Egypt. Plotinus is regarded by modern scholarship as the founder of Neop ...
offers a version of the argument that Kant calls "The Achilles of Rationalist Psychology". Plotinus first argues that the soul is
simple
Simple or SIMPLE may refer to:
*Simplicity, the state or quality of being simple
Arts and entertainment
* ''Simple'' (album), by Andy Yorke, 2008, and its title track
* "Simple" (Florida Georgia Line song), 2018
* "Simple", a song by Johnn ...
, then notes that a simple being cannot decompose. Many subsequent philosophers have argued both that the soul is simple and that it must be immortal. The tradition arguably culminates with
Moses Mendelssohn
Moses Mendelssohn (6 September 1729 – 4 January 1786) was a German-Jewish philosopher and theologian. His writings and ideas on Jews and the Jewish religion and identity were a central element in the development of the ''Haskalah'', or 'Je ...
Theodore Metochites
Theodore Metochites ( el, Θεόδωρος Μετοχίτης; 1270–1332) was a Byzantine Greek statesman, author, gentleman philosopher, and patron of the arts. From c. 1305 to 1328 he held the position of personal adviser ('' mesazōn'') to e ...
argues that part of the soul's nature is to move itself, but that a given movement will cease only if what causes the movement is separated from the thing moved – an impossibility if they are one and the same.
Avicenna
Avicenna
Ibn Sina ( fa, ابن سینا; 980 – June 1037 CE), commonly known in the West as Avicenna (), was a Persian polymath who is regarded as one of the most significant physicians, astronomers, philosophers, and writers of the Islamic G ...
argued for the distinctness of the soul and the body, and the incorruptibility of the former.
Aquinas
The full argument for the immortality of the soul and
Thomas Aquinas
Thomas Aquinas, OP (; it, Tommaso d'Aquino, lit=Thomas of Aquino; 1225 – 7 March 1274) was an Italian Dominican friar and priest who was an influential philosopher, theologian and jurist in the tradition of scholasticism; he is known wi ...
' elaboration of Aristotelian theory is found in Question 75 of the First Part of the ''
Summa Theologica
The ''Summa Theologiae'' or ''Summa Theologica'' (), often referred to simply as the ''Summa'', is the best-known work of Thomas Aquinas (1225–1274), a scholasticism, scholastic theologian and Doctor of the Church. It is a compendium of all ...
''.
Descartes
René Descartes
René Descartes ( or ; ; Latinized: Renatus Cartesius; 31 March 1596 – 11 February 1650) was a French philosopher, scientist, and mathematician, widely considered a seminal figure in the emergence of modern philosophy and science. Mathem ...
endorses the claim that the soul is simple, and also that this entails that it cannot decompose. Descartes does not address the possibility that the soul might suddenly disappear.
Leibniz
In early work,
Gottfried Wilhelm Leibniz
Gottfried Wilhelm (von) Leibniz . ( – 14 November 1716) was a German polymath active as a mathematician, philosopher, scientist and diplomat. He is one of the most prominent figures in both the history of philosophy and the history of mathema ...
endorses a version of the argument from the simplicity of the soul to its immortality, but like his predecessors, he does not address the possibility that the soul might suddenly disappear. In his
monadology
The ''Monadology'' (french: La Monadologie, 1714) is one of Gottfried Leibniz's best known works of his later philosophy. It is a short text which presents, in some 90 paragraphs, a metaphysics of simple substances, or '' monads''.
Text
Dur ...
he advances a sophisticated novel argument for the immortality of monads.
Moses Mendelssohn
Moses Mendelssohn
Moses Mendelssohn (6 September 1729 – 4 January 1786) was a German-Jewish philosopher and theologian. His writings and ideas on Jews and the Jewish religion and identity were a central element in the development of the ''Haskalah'', or 'Je ...
's '' Phaedon'' is a defense of the simplicity and immortality of the soul. It is a series of three dialogues, revisiting the Platonic dialogue ''
Phaedo
''Phædo'' or ''Phaedo'' (; el, Φαίδων, ''Phaidōn'' ), also known to ancient readers as ''On The Soul'', is one of the best-known dialogues of Plato's middle period, along with the ''Republic'' and the ''Symposium.'' The philosophical ...
'', in which
Socrates
Socrates (; ; –399 BC) was a Greek philosopher from Athens who is credited as the founder of Western philosophy and among the first moral philosophers of the ethical tradition of thought. An enigmatic figure, Socrates authored no te ...
argues for the immortality of the soul, in preparation for his own death. Many philosophers, including Plotinus, Descartes, and Leibniz, argue that the soul is simple, and that because simples cannot decompose they must be immortal. In the Phaedon, Mendelssohn addresses gaps in earlier versions of this argument (an argument that Kant calls the Achilles of Rationalist Psychology). The Phaedon contains an original argument for the simplicity of the soul, and also an original argument that simples cannot suddenly disappear. It contains further original arguments that the soul must retain its rational capacities as long as it exists.
Ethics
The possibility of clinical immortality raises a host of medical, philosophical, and religious issues and ethical questions. These include
persistent vegetative state
A persistent vegetative state (PVS) or post-coma unresponsiveness (PCU) is a disorder of consciousness in which patients with severe brain damage are in a state of partial arousal rather than true awareness. After four weeks in a vegetative stat ...
s, the nature of personality over time, technology to mimic or copy the mind or its processes, social and economic disparities created by
longevity
The word " longevity" is sometimes used as a synonym for "life expectancy" in demography. However, the term ''longevity'' is sometimes meant to refer only to especially long-lived members of a population, whereas ''life expectancy'' is always d ...
, and survival of the
heat death of the universe
The heat death of the universe (also known as the Big Chill or Big Freeze) is a hypothesis on the ultimate fate of the universe, which suggests the universe will evolve to a state of no thermodynamic free energy, and will therefore be unabl ...
.
Undesirability
Physical immortality has also been imagined as a form of eternal torment, as in the myth of
Tithonus
In Greek mythology, Tithonus ( or ; grc, Τιθωνός, Tithonos) was the lover of Eos, Goddess of the Dawn. He was a prince of Troy, the son of King Laomedon by the Naiad Strymo (Στρυμώ). The mythology reflected by the fifth-century vas ...
, or in
Mary Shelley
Mary Wollstonecraft Shelley (; ; 30 August 1797 – 1 February 1851) was an English novelist who wrote the Gothic fiction, Gothic novel ''Frankenstein, Frankenstein; or, The Modern Prometheus'' (1818), which is considered an History of scie ...
's short story '' The Mortal Immortal'', where the protagonist lives to witness everyone he cares about die around him. For additional examples in fiction, see
Immortality in fiction
Immortality is a common theme in fiction. The concept has been depicted since the ''Epic of Gilgamesh'', the oldest known work of fiction. Originally appearing in the domain of mythology, it has later become a recurring element in the genres of ...
.
Kagan (2012) argues that any form of human immortality would be undesirable. Kagan's argument takes the form of a dilemma. Either our characters remain essentially the same in an immortal afterlife, or they do not:
* If our characters remain basically the same – that is, if we retain more or less the desires, interests, and goals that we have now – then eventually, over an infinite stretch of time, we will get bored and find eternal life unbearably tedious.
* If, on the other hand, our characters are radically changed – e.g., by God periodically erasing our memories or giving us rat-like brains that never tire of certain simple pleasures – then such a person would be too different from our current self for us to care much what happens to them.
Either way, Kagan argues, immortality is unattractive. The best outcome, Kagan argues, would be for humans to live as long as they desired and then to accept death gratefully as rescuing us from the unbearable tedium of immortality.
Sociology
If human beings were to achieve immortality, there would most likely be a change in the world's
social structures
In the social sciences, social structure is the aggregate of patterned social arrangements in society that are both emergent from and determinant of the actions of individuals. Likewise, society is believed to be grouped into structurally rel ...
. Sociologists argue that human beings' awareness of their own
mortality
Mortality is the state of being mortal, or susceptible to death; the opposite of immortality.
Mortality may also refer to:
* Fish mortality, a parameter used in fisheries population dynamics to account for the loss of fish in a fish stock throug ...
shapes their behavior. With the advancements in medical technology in extending human life, there may need to be serious considerations made about future social structures. The world is already experiencing a global
demographic shift
In demography, demographic transition is a phenomenon and theory which refers to the historical shift from high birth rates and high death rates in societies with minimal technology, education (especially of women) and economic development, to l ...
of increasingly ageing populations with lower replacement rates. The social changes that are made to accommodate this new population shift may be able to offer insight on the possibility of an immortal society.
Sociology has a growing body of literature on the sociology of immortality, which details the different attempts at reaching immortality (whether actual or symbolic) and their prominence in the 21st century. These attempts include renewed attention to the dead in the West, practices of online memorialization, and biomedical attempts to increase longevity. These attempts at reaching immortality and their effects in societal structures have led some to argue that we are becoming a "Postmortal Society". Foreseen changes to societies derived from the pursuit of immortality would encompass societal paradigms and worldviews, as well as the institutional landscape. Similarly, different forms of reaching immortality might entail a significant reconfiguration of societies, from becoming more technologically-oriented to becoming more aligned with nature
Immortality would increase population growth, bringing with it many consequences as for example the impact of population growth on the environment and
planetary boundaries
Planetary boundaries is a concept highlighting human-caused perturbations of Earth systems making them relevant in a way not accommodated by the environmental boundaries separating the three ages within the Holocene epoch. Crossing a planetary ...
.
Politics
Although some scientists state that radical life extension, delaying and stopping aging are achievable, there are no international or national programs focused on stopping aging or on radical life extension. In 2012 in Russia, and then in the United States, Israel and the Netherlands, pro-immortality political parties were launched. They aimed to provide political support to anti-aging and radical life extension research and technologies and at the same time transition to the next step, radical life extension, life without aging, and finally, immortality and aim to make possible access to such technologies to most currently living people.
Symbols
There are numerous symbols representing immortality. The
ankh
Progressive ankylosis protein homolog (ANK ilosis H omolog) is a protein that in humans is encoded by the ''ANKH'' gene.
This gene encodes a multipass transmembrane protein that is expressed in joints and other tissues and controls pyrophosphate ...
is an Egyptian symbol of life that holds connotations of immortality when depicted in the hands of the
gods
A deity or god is a supernatural being who is considered divine or sacred. The ''Oxford Dictionary of English'' defines deity as a god or goddess, or anything revered as divine. C. Scott Littleton defines a deity as "a being with powers greater ...
and
pharaoh
Pharaoh (, ; Egyptian: ''pr ꜥꜣ''; cop, , Pǝrro; Biblical Hebrew: ''Parʿō'') is the vernacular term often used by modern authors for the kings of ancient Egypt who ruled as monarchs from the First Dynasty (c. 3150 BC) until the an ...
s, who were seen as having control over the journey of life. The
Möbius strip
In mathematics, a Möbius strip, Möbius band, or Möbius loop is a surface that can be formed by attaching the ends of a strip of paper together with a half-twist. As a mathematical object, it was discovered by Johann Benedict Listing and Augu ...
in the shape of a
trefoil knot
In knot theory, a branch of mathematics, the trefoil knot is the simplest example of a nontrivial knot. The trefoil can be obtained by joining together the two loose ends of a common overhand knot, resulting in a knotted loop. As the simplest kno ...
is another symbol of immortality. Most symbolic representations of infinity or the life cycle are often used to represent immortality depending on the context they are placed in. Other examples include the
Ouroboros
The ouroboros or uroboros () is an ancient symbol depicting a serpent or dragon eating its own tail. The ouroboros entered Western tradition via ancient Egyptian iconography and the Greek magical tradition. It was adopted as a symbol in Gnost ...
, the Chinese fungus of longevity, the ''ten''
kanji
are the logographic Chinese characters taken from the Chinese family of scripts, Chinese script and used in the writing of Japanese language, Japanese. They were made a major part of the Japanese writing system during the time of Old Japanese ...
, the
phoenix
Phoenix most often refers to:
* Phoenix (mythology), a legendary bird from ancient Greek folklore
* Phoenix, Arizona, a city in the United States
Phoenix may also refer to:
Mythology
Greek mythological figures
* Phoenix (son of Amyntor), a ...
, the
peacock
Peafowl is a common name for three bird species in the genera ''Pavo (genus), Pavo'' and ''Afropavo'' within the tribe Pavonini of the family Phasianidae, the pheasants and their allies. Male peafowl are referred to as peacocks, and female pea ...
in Christianity, and the colors amaranth (in
Western culture
Leonardo da Vinci's ''Vitruvian Man''. Based on the correlations of ideal Body proportions">human proportions with geometry described by the ancient Roman architect Vitruvius in Book III of his treatise ''De architectura''.
image:Plato Pio-Cle ...
) and peach (in
Chinese culture
Chinese culture () is one of the world's oldest cultures, originating thousands of years ago. The culture prevails across a large geographical region in East Asia and is extremely diverse and varying, with customs and traditions varying grea ...
).
See also
*
Afterlife
The afterlife (also referred to as life after death) is a purported existence in which the essential part of an individual's identity or their stream of consciousness continues to live after the death of their physical body. The surviving ess ...
*
Akal (Sikh term)
Akaal (or Akal) (Gurmukhi: ਅਕਾਲ) (which means timeless, immortal, non-temporal), is an important term in Sikh tradition and philosophy. It is extensively used in the Dasam Granth hymns by Guru Gobind Singh, who titled one of his poeti ...
*
Ambrosia
In the ancient Greek myths, ''ambrosia'' (, grc, ἀμβροσία 'immortality'), the food or drink of the Greek gods, is often depicted as conferring longevity or immortality upon whoever consumed it. It was brought to the gods in Olympus ...
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Amrita
''Amrita'' ( sa, अमृत, IAST: ''amṛta''), ''Amrit'' or ''Amata'' in Pali, (also called ''Sudha'', ''Amiy'', ''Ami'') is a Sanskrit word that means "immortality". It is a central concept within Indian religions and is often referred to i ...
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Bioethics
Bioethics is both a field of study and professional practice, interested in ethical issues related to health (primarily focused on the human, but also increasingly includes animal ethics), including those emerging from advances in biology, med ...
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Biogerontology
Biogerontology is the sub-field of gerontology concerned with the biological aging process, its evolutionary origins, and potential means to intervene in the process. The term "biogerontology" was coined by S. Rattan, and came in regular use wit ...
Crown of Immortality
The Crown of Immortality is a literary and religious metaphor traditionally represented in art first as a laurel wreath and later as a symbolic circle of stars (often a crown, tiara, halo or aureola). The Crown appears in a number of Baroque icon ...
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Dyson's eternal intelligence
Dyson's eternal intelligence concept (the Dyson Scenario), proposed by Freeman Dyson in 1979, proposes a means by which an immortal society of intelligent beings in an open universe may escape the prospect of the heat death of the universe by ex ...
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Elixir of life
The elixir of life, also known as elixir of immortality, is a potion that supposedly grants the drinker eternal life and/or eternal youth. This elixir was also said to cure all diseases. Alchemists in various ages and cultures sought the means ...
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Eternal return
Eternal return (german: Ewige Wiederkunft; also known as eternal recurrence) is a concept that the universe and all existence and energy has been recurring, and will continue to recur in a self similar form an infinite number of times across in ...
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Eternal youth
Eternal youth is the concept of human physical immortality free of ageing. The youth referred to is usually meant to be in contrast to the depredations of aging, rather than a specific age of the human lifespan. Eternal youth is common in myth ...
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Ghost
A ghost is the soul or spirit of a dead person or animal that is believed to be able to appear to the living. In ghostlore, descriptions of ghosts vary widely from an invisible presence to translucent or barely visible wispy shapes, to rea ...
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Immortal DNA strand hypothesis
The immortal DNA strand hypothesis was proposed in 1975 by John Cairns as a mechanism for adult stem cells to minimize mutations in their genomes. This hypothesis proposes that instead of segregating their DNA during mitosis in a random manner, ...
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Immortalist Society
The Immortalist Society is a charitable 501(c)(3) organization devoted to research and education in the areas of cryonics and life extension. It was incorporated as a Michigan corporation by Robert Ettinger and five other local residents on June ...
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Immortality in fiction
Immortality is a common theme in fiction. The concept has been depicted since the ''Epic of Gilgamesh'', the oldest known work of fiction. Originally appearing in the domain of mythology, it has later become a recurring element in the genres of ...
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Internal alchemy
Neidan, or internal alchemy (), is an array of esoteric doctrines and physical, mental, and spiritual practices that Taoist initiates use to prolong life and create an immortal spiritual body that would survive after death. Also known as Jindan ...
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Lich
In fantasy fiction, a lich (; from the Old English , meaning "corpse") is a type of undead creature.
Various works of fantasy fiction, such as Clark Ashton Smith's "The Empire of the Necromancers" (1932), had used ''lich'' as a general term fo ...
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List of people claimed to be immortal in myth and legend
This is a list of people claimed to be immortal. This list does not reference purely spiritual entities (spirits, gods, demons, angels), non-humans (monsters, aliens, elves), or artificial life (artificial intelligence, robots).
This list comprise ...
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Methuselah Mouse Prize
The Methuselah Foundation is an American-based global non-profit organization, based in Springfield, Virginia, with a declared mission to "make 90 the new 50 by 2030" by supporting tissue engineering and regenerative medicine therapies. The orga ...
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Molecular nanotechnology
Molecular nanotechnology (MNT) is a technology based on the ability to build structures to complex, atomic specifications by means of mechanosynthesis. This is distinct from nanoscale materials. Based on Richard Feynman's vision of miniature ...
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Negligible senescence
Negligible senescence is a term coined by biogerontologist Caleb Finch to denote organisms that do not exhibit evidence of biological aging (senescence), such as measurable reductions in their reproductive capability, measurable functional decline ...
Organlegging
Organ theft is the forcible removal of a person's organs to be used as transplants and sold on the black market. While some cases of organ theft are urban legends, others have been found to be true. It is also a commonly used trope in science fi ...
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Posthuman
Posthuman or post-human is a concept originating in the fields of science fiction, futurology, contemporary art, and philosophy that means a person or entity that exists in a state beyond being human. The concept aims at addressing a variety of ...
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Resurrection
Resurrection or anastasis is the concept of coming back to life after death. In a number of religions, a dying-and-rising god is a deity which dies and is resurrected. Reincarnation is a similar process hypothesized by other religions, which ...
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Queen Mother of the West
The Queen Mother of the West, known by various local names, is a mother goddess in Chinese religion and mythology, also worshipped in neighbouring Asian countries, and attested from ancient times. From her name alone some of her most importan ...
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Simulated reality
The simulation theory is the hypothesis that reality could be simulated—for example by quantum computer simulation—to a degree indistinguishable from "true" reality. It could contain conscious minds that may or may not know that they live i ...
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Suspended animation
Suspended animation is the temporary (short- or long-term) slowing or stopping of biological function so that physiological capabilities are preserved. It may be either hypometabolic or ametabolic in nature. It may be induced by either endogen ...
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Undead
The undead are beings in mythology, legend, or fiction that are deceased but behave as if alive. Most commonly the term refers to corporeal forms of formerly-alive humans, such as mummies, vampires, and zombies, who have been reanimated by super ...
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Regeneration (theology) Regeneration, while sometimes perceived to be a step in the ('order of salvation'), is generally understood in Christian theology to be the objective work of God in a believer's life. Spiritually, it means that God brings a person to new life (that ...
Turritopsis nutricula
''Turritopsis nutricula'' is a small hydrozoan that once reaching adulthood, can transfer its cells back to childhood. This adaptive trait likely evolved in order to extend the life of the individual. Several different species of the genus ''Tur ...