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Skepticism, also spelled scepticism, is a questioning attitude or
doubt Doubt is a mental state in which the mind remains suspended between two or more contradictory propositions, unable to be certain of any of them. Doubt on an emotional level is indecision between belief and disbelief. It may involve uncertainty, ...
toward
knowledge Knowledge can be defined as awareness of facts or as practical skills, and may also refer to familiarity with objects or situations. Knowledge of facts, also called propositional knowledge, is often defined as true belief that is distinc ...
claims that are seen as mere
belief A belief is an attitude that something is the case, or that some proposition is true. In epistemology, philosophers use the term "belief" to refer to attitudes about the world which can be either true or false. To believe something is to take i ...
or
dogma Dogma is a belief or set of beliefs that is accepted by the members of a group without being questioned or doubted. It may be in the form of an official system of principles or doctrines of a religion, such as Roman Catholicism, Judaism, Islam ...
. For example, if a person is skeptical about claims made by their government about an ongoing war then the person doubts that these claims are accurate. In such cases, skeptics normally recommend not disbelief but suspension of belief, i.e. maintaining a neutral attitude that neither affirms nor denies the claim. This attitude is often motivated by the impression that the available
evidence Evidence for a proposition is what supports this proposition. It is usually understood as an indication that the supported proposition is true. What role evidence plays and how it is conceived varies from field to field. In epistemology, evidenc ...
is insufficient to support the claim. Formally, skepticism is a topic of interest in
philosophy Philosophy (from , ) is the systematized study of general and fundamental questions, such as those about existence, reason, knowledge, values, mind, and language. Such questions are often posed as problems to be studied or resolved. Some ...
, particularly
epistemology Epistemology (; ), or the theory of knowledge, is the branch of philosophy concerned with knowledge. Epistemology is considered a major subfield of philosophy, along with other major subfields such as ethics, logic, and metaphysics. Episte ...
. More informally, skepticism as an expression of questioning or doubt can be applied to any topic, such as politics, religion, or pseudoscience. It is often applied within restricted domains, such as morality (
moral skepticism Moral skepticism (or moral scepticism in British English) is a class of meta-ethical theories all members of which entail that no one has any moral knowledge. Many moral skeptics also make the stronger, modal claim that moral knowledge is impo ...
),
atheism Atheism, in the broadest sense, is an absence of belief in the existence of deities. Less broadly, atheism is a rejection of the belief that any deities exist. In an even narrower sense, atheism is specifically the position that there no d ...
(skepticism about the
existence of God The existence of God (or more generally, the existence of deities) is a subject of debate in theology, philosophy of religion and popular culture. A wide variety of arguments for and against the existence of God or deities can be categorized ...
), or the
supernatural Supernatural refers to phenomena or entities that are beyond the laws of nature. The term is derived from Medieval Latin , from Latin (above, beyond, or outside of) + (nature) Though the corollary term "nature", has had multiple meanings si ...
. Some theorists distinguish "good" or moderate skepticism, which seeks strong evidence before accepting a position, from "bad" or radical skepticism, which wants to suspend judgment indefinitely.
Philosophical skepticism Philosophical skepticism ( UK spelling: scepticism; from Greek σκέψις ''skepsis'', "inquiry") is a family of philosophical views that question the possibility of knowledge. It differs from other forms of skepticism in that it even reject ...
is one important form of skepticism. It rejects knowledge claims that seem certain from the perspective of
common sense ''Common Sense'' is a 47-page pamphlet written by Thomas Paine in 1775–1776 advocating independence from Great Britain to people in the Thirteen Colonies. Writing in clear and persuasive prose, Paine collected various moral and political argu ...
. Radical forms of philosophical skepticism deny that "knowledge or rational belief is possible" and urge us to suspend judgment on many or all controversial matters. More moderate forms claim only that nothing can be known with certainty, or that we can know little or nothing about nonempirical matters, such as whether God exists, whether human beings have free will, or whether there is an afterlife. In ancient philosophy, skepticism was understood as a way of life associated with
inner peace Inner peace (or peace of mind) refers to a deliberate state of psychological or spiritual calm despite the potential presence of stressors. Being "at peace" is considered by many to be healthy (homeostasis) and the opposite of being stressed or an ...
. Skepticism has been responsible for many important developments in science and philosophy. It has also inspired several contemporary social movements.
Religious skepticism Religious skepticism is a type of skepticism relating to religion. Religious skeptics question religious authority and are not necessarily anti-religious but skeptical of specific or all religious beliefs and/or practices. Socrates was one of t ...
advocates for doubt concerning basic religious principles, such as immortality,
providence Providence often refers to: * Providentia, the divine personification of foresight in ancient Roman religion * Divine providence, divinely ordained events and outcomes in Christianity * Providence, Rhode Island, the capital of Rhode Island in the ...
, and
revelation In religion and theology, revelation is the revealing or disclosing of some form of truth or knowledge through communication with a deity or other supernatural entity or entities. Background Inspiration – such as that bestowed by God on the ...
.
Scientific skepticism Scientific skepticism or rational skepticism (also spelled scepticism), sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence. In practice, the term most commonly refe ...
advocates for testing beliefs for reliability, by subjecting them to systematic investigation using the
scientific method The scientific method is an empirical method for acquiring knowledge that has characterized the development of science since at least the 17th century (with notable practitioners in previous centuries; see the article history of scientific m ...
, to discover
empirical evidence Empirical evidence for a proposition is evidence, i.e. what supports or counters this proposition, that is constituted by or accessible to sense experience or experimental procedure. Empirical evidence is of central importance to the sciences and ...
for them.


Definition and semantic field

''Skepticism'', also spelled ''scepticism'', (from the Greek 'σκέπτομαι' skeptomai, to search, to think about or look for) refers to a doubtful attitude toward
knowledge Knowledge can be defined as awareness of facts or as practical skills, and may also refer to familiarity with objects or situations. Knowledge of facts, also called propositional knowledge, is often defined as true belief that is distinc ...
claims. So if a person is skeptical of their government's claims about an ongoing war then the person has doubts that these claims are true. Or being skeptical that one's favorite hockey team will win the championship means that one is uncertain about the strength of their performance. Skepticism about a claim implies that one does not
believe Believe may refer to: *Belief, a psychological state in which an individual holds a proposition or premise to be true, with or without proof for such proposition *Faith, a belief in something which has not been proven Arts, entertainment, and me ...
this claim to be true. But it does not automatically follow that one should believe that the claim is false either. Instead, skeptics usually recommend a neutral attitude: beliefs about this matter should be suspended. In this regard, skepticism about a claim can be defined as the thesis that "the only justified attitude with respect to
his claim His or HIS may refer to: Computing * Hightech Information System, a Hong Kong graphics card company * Honeywell Information Systems * Hybrid intelligent system * Microsoft Host Integration Server Education * Hangzhou International School, in ...
is suspension of judgment". It is often motivated by the impression that one cannot be certain about it. This is especially relevant when there is significant expert disagreement. Skepticism is usually restricted to a claim or a field of inquiry. So religious and moral skeptics have a doubtful attitude about religious and moral doctrines. But some forms of philosophical skepticism, are wider in that they reject any form of knowledge. Some definitions, often inspired by
ancient philosophy This page lists some links to ancient philosophy, namely philosophical thought extending as far as early post-classical history (). Overview Genuine philosophical thought, depending upon original individual insights, arose in many cultures ...
, see skepticism not just as an attitude but as a way of life. This is based on the idea that maintaining the skeptical attitude of doubt toward most concerns in life is somehow superior compared to living in dogmatic certainty, for example, because such a skeptic person has more
happiness Happiness, in the context of Mental health, mental or emotional states, is positive or Pleasure, pleasant emotions ranging from contentment to intense joy. Other forms include life satisfaction, well-being, subjective well-being, flourishin ...
and peace of mind or because it is morally better. In
contemporary philosophy Contemporary philosophy is the present period in the history of Western philosophy beginning at the early 20th century with the increasing professionalization of the discipline and the rise of analytic and continental philosophy. The phrase "c ...
, on the other hand, skepticism is often understood neither as an attitude nor as a way of life but as a thesis: the thesis that knowledge does not exist. Skepticism is related to various terms. It is sometimes equated with
agnosticism Agnosticism is the view or belief that the existence of God, of the divine or the supernatural is unknown or unknowable. (page 56 in 1967 edition) Another definition provided is the view that "human reason is incapable of providing sufficient ...
and
relativism Relativism is a family of philosophical views which deny claims to objectivity within a particular domain and assert that valuations in that domain are relative to the perspective of an observer or the context in which they are assessed. Ther ...
. However, there are slight differences in meaning. Agnosticism is often understood more narrowly as skepticism about religious questions, in particular, about the
Christian doctrine Christian theology is the theology of 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 theologians use biblical exegesis, ...
. Relativism does not deny the existence of knowledge or truth but holds that they are relative to a person and differ from person to person, for example, because they follow different cognitive norms. The opposite of skepticism is
dogmatism Dogma is a belief or set of beliefs that is accepted by the members of a group without being questioned or doubted. It may be in the form of an official system of principles or doctrines of a religion, such as Roman Catholicism, Judaism, Islam o ...
, which implies an attitude of certainty in the form of an unquestioning belief. A similar contrast is often drawn in relation to blind faith and credulity.


Types

Various types of skepticism have been discussed in the academic literature. Skepticism is usually restricted to knowledge claims on one particular subject, which is why its different forms can be distinguished based on the subject. For example,
religious skeptics Religion is usually defined as a social system, social-cultural system of designated religious behaviour, behaviors and practices, morality, morals, beliefs, worldviews, religious text, texts, sacred site, sanctified places, prophecy, prophecie ...
distrust
religious doctrines Doctrine (from la, Wikt:doctrina, doctrina, meaning "teaching, instruction") is a codification (law), codification of beliefs or a body of teacher, teachings or instructions, taught principles or positions, as the essence of teachings in a given ...
and moral skeptics raise doubts about accepting various moral requirements and customs. Skepticism can also be applied to knowledge in general. However, this attitude is usually only found in some forms of philosophical skepticism. A closely related classification distinguishes based on the source of knowledge, such as skepticism about
perception Perception () is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment. All perception involves signals that go through the nervous system ...
,
memory Memory is the faculty of the mind by which data or information is encoded, stored, and retrieved when needed. It is the retention of information over time for the purpose of influencing future action. If past events could not be remembered, ...
, or
intuition Intuition is the ability to acquire knowledge without recourse to conscious reasoning. Different fields use the word "intuition" in very different ways, including but not limited to: direct access to unconscious knowledge; unconscious cognition; ...
. A further distinction is based on the degree of the skeptical attitude. The strongest forms assert that there is no knowledge at all or that it is impossible. Weaker forms merely state that one can never be absolutely certain. Some theorists distinguish between a good or healthy form of moderate skepticism in contrast to a bad or unhealthy form of radical skepticism. On this view, the "good" skeptic is a critically-minded person who seeks strong evidence before accepting a position. The "bad" skeptic, on the other hand, wants to "suspend judgment indefinitely ... even in the face of demonstrable truth". Another categorization focuses on the motivation for the skeptical attitude. Some skeptics have
ideological An ideology is a set of beliefs or philosophies attributed to a person or group of persons, especially those held for reasons that are not purely epistemic, in which "practical elements are as prominent as theoretical ones." Formerly applied prim ...
motives: they want to replace inferior beliefs with better ones. Others have a more practical outlook in that they see problematic beliefs as the cause of harmful customs they wish to stop. Some skeptics have very particular goals in mind, such as bringing down a certain institution associated with the spread of claims they reject.
Philosophical skepticism Philosophical skepticism ( UK spelling: scepticism; from Greek σκέψις ''skepsis'', "inquiry") is a family of philosophical views that question the possibility of knowledge. It differs from other forms of skepticism in that it even reject ...
is a prominent form of skepticism and can be contrasted with non-philosophical or ordinary skepticism. Ordinary skepticism involves a doubting attitude toward knowledge claims that are rejected by many. Almost everyone shows some form of ordinary skepticism, for example, by doubting the knowledge claims made by
flat earthers Modern flat Earth beliefs are promoted by organizations and individuals which make claims that the Earth is flat while denying the Earth's sphericity, contrary to over two millennia of scientific consensus. Flat Earth beliefs are pseudoscie ...
or
astrologer Astrology is a range of divinatory practices, recognized as pseudoscientific since the 18th century, that claim to discern information about human affairs and terrestrial events by studying the apparent positions of celestial objects. Dif ...
s. Philosophical skepticism, on the other hand, is a much more radical and rare position. It includes the rejection of knowledge claims that seem certain from the perspective of
common sense ''Common Sense'' is a 47-page pamphlet written by Thomas Paine in 1775–1776 advocating independence from Great Britain to people in the Thirteen Colonies. Writing in clear and persuasive prose, Paine collected various moral and political argu ...
. Some forms of it even deny that one knows that "I have two hands" or that "the sun will come out tomorrow". It is taken seriously in philosophy nonetheless since it has proven very hard to conclusively refute philosophical skepticism.


In various fields

Skepticism has been responsible for important developments in various fields, such as
science Science is a systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earliest archeological evidence for ...
,
medicine Medicine is the science and practice of caring for a patient, managing the diagnosis, prognosis, prevention, treatment, palliation of their injury or disease, and promoting their health. Medicine encompasses a variety of health care pract ...
, and
philosophy Philosophy (from , ) is the systematized study of general and fundamental questions, such as those about existence, reason, knowledge, values, mind, and language. Such questions are often posed as problems to be studied or resolved. Some ...
. In science, the skeptical attitude toward traditional opinions was a key factor in the development of the
scientific method The scientific method is an empirical method for acquiring knowledge that has characterized the development of science since at least the 17th century (with notable practitioners in previous centuries; see the article history of scientific m ...
. It emphasizes the need to scrutinize knowledge claims by testing them through
experimentation An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried. Experiments provide insight into cause-and-effect by demonstrating what outcome occurs when ...
and precise
measurement Measurement is the quantification of attributes of an object or event, which can be used to compare with other objects or events. In other words, measurement is a process of determining how large or small a physical quantity is as compared ...
. In the field of medicine, skepticism has helped the establishment of more advanced forms of treatment by putting into doubt traditional forms based on intuitive appeal rather than
empirical evidence Empirical evidence for a proposition is evidence, i.e. what supports or counters this proposition, that is constituted by or accessible to sense experience or experimental procedure. Empirical evidence is of central importance to the sciences and ...
. In the history of philosophy, skepticism has often played a productive role not just for skeptics but also for non-skeptical philosophers. This is due to its critical attitude that continues to challenge the
epistemological Epistemology (; ), or the theory of knowledge, is the branch of philosophy concerned with knowledge. Epistemology is considered a major subfield of philosophy, along with other major subfields such as ethics, logic, and metaphysics. Episte ...
foundations of a great variety of philosophical theories. This challenge can help to keep speculation in check and may provoke creative responses transforming the theory in question in order to overcome the problems posed by skepticism. According to Richard H. Popkin, "the history of philosophy can be seen, in part, as a struggle with skepticism". In this regard, it has led many contemporary philosophers to abandon the quest for absolutely certain or indubitable first principles of philosophy, which was still prevalent in many earlier periods. Skepticism has been an important topic throughout the history of philosophy and is still a widely discussed subject today.


Philosophy

As a philosophical school or movement, skepticism arose both in ancient Greece and India. In India the
Ajñana ''Ajñāna'' () was one of the ''nāstika'' or "heterodox" schools of ancient Indian philosophy, and the ancient school of radical Indian skepticism. It was a Śramaṇa movement and a major rival of early Buddhism, Jainism and the Ājīvika ...
school of philosophy espoused skepticism. It was a major early rival of
Buddhism Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and gra ...
and
Jainism Jainism ( ), also known as Jain Dharma, is an Indian religions, Indian religion. Jainism traces its spiritual ideas and history through the succession of twenty-four tirthankaras (supreme preachers of ''Dharma''), with the first in the current ...
, and a possibly major influence on Buddhism. Two of the foremost disciples of the
Buddha Siddhartha Gautama, most commonly referred to as the Buddha, was a śramaṇa, wandering ascetic and religious teacher who lived in South Asia during the 6th or 5th century BCE and founded Buddhism. According to Buddhist tradition, he was ...
, Sariputta and
Moggallāna Maudgalyāyana ( pi, Moggallāna), also known as Mahāmaudgalyāyana or by his birth name Kolita, was one of Gautama Buddha, the Buddha's closest disciples. Described as a contemporary of disciples such as Subhuti, Śāriputra ('), and Mahāk ...
, were initially the students of the Ajñana philosopher
Sanjaya Belatthiputta Sañjaya Belatthiputra (Pali: '; Sanskrit: ''Sañjaya Vairatiputra''; literally, "Sañjaya of the Belattha clan"), was an Indian ascetic philosopher who lived around the 7th-6th century BC in the region of Magadha. He was contemporaneous with M ...
, and a strong element of skepticism is found in
Early Buddhism The term Early Buddhism can refer to at least two distinct periods in the History of Buddhism, mostly in the History of Buddhism in India: * Pre-sectarian Buddhism, which refers to the teachings and monastic organization and structure, founded by Ga ...
, most particularly in the Aṭṭhakavagga sutra, but it is inconclusive the total effect these philosophies had on each other. Since skepticism is a philosophical attitude and a style of philosophizing rather than a position, the Ajñanins may have influenced other skeptical thinkers of India such as
Nagarjuna Nāgārjuna . 150 – c. 250 CE (disputed)was an Indian Mahāyāna Buddhist thinker, scholar-saint and philosopher. He is widely considered one of the most important Buddhist philosophers.Garfield, Jay L. (1995), ''The Fundamental Wisdom of ...
,
Jayarāśi Bhaṭṭa (fl. c. 800) was an Indian philosopher known for his radical skepticism who most likely flourished between 800-840 probably in southern India. He was the author of one of the most extraordinary philosophical work in Indian history, the ''Tattvopapl ...
, and
Shriharsha Shri-harsha (IAST: Śrīharṣa) was a 7th century Indian philosopher and poet. Shri Harsha's works concern Advaita Vedanta, Nyaya and other themes in Hindu Philosophy. Early life Śrīharṣa was the son of Śrīhira and Mamalladevī. His fath ...
. In Greece philosophers as early as
Xenophanes Xenophanes of Colophon (; grc, Ξενοφάνης ὁ Κολοφώνιος ; c. 570 – c. 478 BC) was a Greek philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φ ...
(c. 570 – c. 475 BCE) expressed skeptical views, as did
Democritus Democritus (; el, Δημόκριτος, ''Dēmókritos'', meaning "chosen of the people"; – ) was an Ancient Greek pre-Socratic philosopher from Abdera, primarily remembered today for his formulation of an atomic theory of the universe. No ...
and a number of
Sophists A sophist ( el, σοφιστής, sophistes) was a teacher in ancient Greece in the fifth and fourth centuries BC. Sophists specialized in one or more subject areas, such as philosophy, rhetoric, music, athletics, and mathematics. They taught ' ...
.
Gorgias Gorgias (; grc-gre, Γοργίας; 483–375 BC) was an ancient Greek sophist, pre-Socratic philosopher, and rhetorician who was a native of Leontinoi in Sicily. Along with Protagoras, he forms the first generation of Sophists. Several doxogr ...
, for example, reputedly argued that nothing exists, that even if there were something we could not know it, and that even if we could know it we could not communicate it. The
Heraclitean Heraclitus of Ephesus (; grc-gre, Ἡράκλειτος , "Glory of Hera"; ) was an ancient Greek pre-Socratic philosopher from the city of Ephesus, which was then part of the Persian Empire. Little is known of Heraclitus's life. He wrote a ...
philosopher
Cratylus Cratylus ( ; grc, Κρατύλος, ''Kratylos'') was an ancient Athenian philosopher from the mid-late 5th century BCE, known mostly through his portrayal in Plato's dialogue '' Cratylus''. He was a radical proponent of Heraclitean philosophy ...
refused to discuss anything and would merely wriggle his finger, claiming that communication is impossible since meanings are constantly changing.
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 ...
also had skeptical tendencies, claiming to know nothing worthwhile. There were two major schools of skepticism in the ancient Greek and Roman world. The first was
Pyrrhonism Pyrrhonism is a school of philosophical skepticism founded by Pyrrho in the fourth century BCE. It is best known through the surviving works of Sextus Empiricus, writing in the late second century or early third century CE. History Pyrrho of E ...
, founded by
Pyrrho of Elis Pyrrho of Elis (; grc, Πύρρων ὁ Ἠλεῖος, Pyrrhо̄n ho Ēleios; ), born in Elis, Greece, was a Greek philosopher of Classical antiquity, credited as being the first Greek skeptic philosopher and founder of Pyrrhonism. Life ...
(c. 360–270 BCE). The second was
Academic Skepticism Academic skepticism refers to the skeptical period of ancient Platonism dating from around 266 BCE, when Arcesilaus became scholarch of the Platonic Academy, until around 90 BCE, when Antiochus of Ascalon rejected skepticism, although individua ...
, so-called because its two leading defenders,
Arcesilaus Arcesilaus (; grc-gre, Ἀρκεσίλαος; 316/5–241/0 BC) was a Greek Hellenistic philosopher. He was the founder of Academic Skepticism and what is variously called the Second or Middle or New Academy – the phase of the Platonic Acade ...
(c. 315–240 BCE) who initiated the philosophy, and
Carneades Carneades (; el, Καρνεάδης, ''Karneadēs'', "of Carnea"; 214/3–129/8 BC) was a Greek philosopher and perhaps the most prominent head of the Skeptical Academy in ancient Greece. He was born in Cyrene. By the year 159 BC, he had begu ...
(c. 217–128 BCE), the philosophy's most famous proponent, were heads of Plato's
Academy An academy ( Attic Greek: Ἀκαδήμεια; Koine Greek Ἀκαδημία) is an institution of secondary or tertiary higher learning (and generally also research or honorary membership). The name traces back to Plato's school of philosophy ...
. Pyrrhonism's aims are psychological. It urges suspension of judgment ('' epoche'') to achieve mental tranquility (''
ataraxia ''Ataraxia'' (Greek: ἀταραξία, from ("a-", negation) and ''tarachē'' "disturbance, trouble"; hence, "unperturbedness", generally translated as "imperturbability", "equanimity", or "tranquility") is a Greek term first used in Ancient Gre ...
''). The Academic Skeptics denied that knowledge is possible (''
acatalepsy In philosophy, acatalepsy (from the Greek ἀκαταληψία "inability to comprehend" from alpha privative and καταλαμβάνειν, "to seize") is incomprehensibleness, or the impossibility of comprehending or conceiving a thing. It ...
''). The Academic Skeptics claimed that some beliefs are more reasonable or probable than others, whereas Pyrrhonian skeptics argue that equally compelling arguments can be given for or against any disputed view. Nearly all the writings of the ancient skeptics are now lost. Most of what we know about ancient skepticism is from
Sextus Empiricus Sextus Empiricus ( grc-gre, Σέξτος Ἐμπειρικός, ; ) was a Ancient Greece, Greek Pyrrhonism, Pyrrhonist philosopher and Empiric school physician. His philosophical works are the most complete surviving account of ancient Greek and ...
, a Pyrrhonian skeptic who lived in the second or third century CE. His works contain a lucid summary of stock skeptical arguments. Ancient skepticism faded out during the late Roman Empire, particularly after
Augustine Augustine of Hippo ( , ; la, Aurelius Augustinus Hipponensis; 13 November 354 – 28 August 430), also known as Saint Augustine, was a theologian and philosopher of Berbers, Berber origin and the bishop of Hippo Regius in Numidia (Roman pr ...
(354–430 CE) attacked the skeptics in his work ''Against the Academics'' (386 CE). There was little knowledge of, or interest in, ancient skepticism in Christian Europe during the Middle Ages. Interest revived during the Renaissance and Reformation, particularly after the complete writings of Sextus Empiricus were translated into Latin in 1569 and
Martin Luther Martin Luther (; ; 10 November 1483 – 18 February 1546) was a German priest, theologian, author, hymnwriter, and professor, and Order of Saint Augustine, Augustinian friar. He is the seminal figure of the Reformation, Protestant Refo ...
's skepticism of holy orders. A number of Catholic writers, including
Francisco Sanches Francisco Sanches (also spelled Sánchez in contemporary sources; c. 1550 – November 16, 1623) was a skeptic, philosopher and physician of Sephardi Jewish origin, born in Tui, Spain (although he was baptized in Braga, Portugal).Elaine Limb ...
(c. 1550–1623),
Michel de Montaigne Michel Eyquem, Sieur de Montaigne ( ; ; 28 February 1533 – 13 September 1592), also known as the Lord of Montaigne, was one of the most significant philosophers of the French Renaissance. He is known for popularizing the essay as a liter ...
(1533–1592),
Pierre Gassendi Pierre Gassendi (; also Pierre Gassend, Petrus Gassendi; 22 January 1592 – 24 October 1655) was a French philosopher, Catholic priest, astronomer, and mathematician. While he held a church position in south-east France, he also spent much tim ...
(1592–1655), and
Marin Mersenne Marin Mersenne, OM (also known as Marinus Mersennus or ''le Père'' Mersenne; ; 8 September 1588 – 1 September 1648) was a French polymath whose works touched a wide variety of fields. He is perhaps best known today among mathematicians for ...
(1588–1648) deployed ancient skeptical arguments to defend moderate forms of skepticism and to argue that faith, rather than reason, must be the primary guide to truth. Similar arguments were offered later (perhaps ironically) by the Protestant thinker
Pierre Bayle Pierre Bayle (; 18 November 1647 – 28 December 1706) was a French philosopher, author, and lexicographer. A Huguenot, Bayle fled to the Dutch Republic in 1681 because of religious persecution in France. He is best known for his '' Historica ...
in his influential Historical and Critical Dictionary (1697–1702). The growing popularity of skeptical views created an intellectual crisis in seventeenth-century Europe. One major response was offered by the French philosopher and mathematician
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 ...
(1596–1650). In his classic work, ''Meditations of First Philosophy'' (1641), Descartes sought to refute skepticism, but only after he had formulated the case for skepticism as powerfully as possible. Descartes argued that no matter what radical skeptical possibilities we imagine there are certain truths (e.g., that thinking is occurring, or that I exist) that are absolutely certain. Thus, the ancient skeptics were wrong to claim that knowledge is impossible. Descartes also attempted to refute skeptical doubts about the reliability of our senses, our memory, and other cognitive faculties. To do this, Descartes tried to prove that God exists and that God would not allow us to be systematically deceived about the nature of reality. Many contemporary philosophers question whether this second stage of Descartes's critique of skepticism is successful. In the eighteenth century a new case for skepticism was offered by the Scottish philosopher
David Hume David Hume (; born David Home; 7 May 1711 NS (26 April 1711 OS) – 25 August 1776) Cranston, Maurice, and Thomas Edmund Jessop. 2020 999br>David Hume" ''Encyclopædia Britannica''. Retrieved 18 May 2020. was a Scottish Enlightenment philo ...
(1711–1776). Hume was an empiricist, claiming that all genuine ideas can be traced back to original impressions of sensation or introspective consciousness. Hume argued that on empiricist grounds there are no sound reasons for belief in God, an enduring self or soul, an external world, causal necessity, objective morality, or inductive reasoning. In fact, he argued that "Philosophy would render us entirely Pyrrhonian, were not Nature too strong for it." As Hume saw it, the real basis of human belief is not reason, but custom or habit. We are hard-wired by nature to trust, say, our memories or inductive reasoning, and no skeptical arguments, however powerful, can dislodge those beliefs. In this way, Hume embraced what he called a "mitigated" skepticism, while rejecting an "excessive" Pyrrhonian skepticism that he saw as both impractical and psychologically impossible. Hume's skepticism provoked a number of important responses. Hume's Scottish contemporary,
Thomas Reid Thomas Reid (; 7 May ( O.S. 26 April) 1710 – 7 October 1796) was a religiously trained Scottish philosopher. He was the founder of the Scottish School of Common Sense and played an integral role in the Scottish Enlightenment. In 1783 he wa ...
(1710–1796), challenged Hume's strict empiricism and argued that it is rational to accept "common-sense" beliefs such as the basic reliability of our senses, our reason, our memories, and inductive reasoning, even though none of these things can be proved. In Reid's view, such common-sense beliefs are foundational and require no proof in order to be rationally justified. Not long after Hume's death, the great German philosopher
Immanuel Kant Immanuel Kant (, , ; 22 April 1724 – 12 February 1804) was a German philosopher and one of the central Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works in epistemology, metaphysics, ethics, and ...
(1724–1804) argued that human moral awareness makes no sense unless we reject Hume's skeptical conclusions about the existence of God, the soul, free will, and an afterlife. According to Kant, while Hume was right to claim that we cannot strictly ''know'' any of these things, our moral experience entitles us to believe in them. Today, skepticism continues to be a topic of lively debate among philosophers. British philosopher,
Julian Baggini Julian Baggini (; born 1968) is a philosopher, journalist and the author of over 20 books about philosophy written for a general audience. He is co-founder of ''The Philosophers' Magazine'' and has written for numerous international newspapers ...
, posits that reason is perceived as "an enemy of mystery and ambiguity," but, if used properly can be an effective tool for solving many larger societal issues.


Religion

Religious skepticism generally refers to doubting given religious beliefs or claims. Historically, religious skepticism can be traced back to
Xenophanes Xenophanes of Colophon (; grc, Ξενοφάνης ὁ Κολοφώνιος ; c. 570 – c. 478 BC) was a Greek philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φ ...
, who doubted many religious claims of his time. For example, a religious skeptic might believe that
Jesus Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesus Christ or Jesus of Nazareth (among other names and titles), was a first-century Jewish preacher and religious ...
existed (see
historicity of Jesus The question of the historicity of Jesus is part of the study of the historical Jesus as undertaken in the quest for the historical Jesus and the scholarly reconstructions of the life of Jesus. Virtually all scholars of antiquity accept that Je ...
) while questioning claims that he was the messiah or performed miracles. Religious skepticism is not the same as
atheism Atheism, in the broadest sense, is an absence of belief in the existence of deities. Less broadly, atheism is a rejection of the belief that any deities exist. In an even narrower sense, atheism is specifically the position that there no d ...
or
agnosticism Agnosticism is the view or belief that the existence of God, of the divine or the supernatural is unknown or unknowable. (page 56 in 1967 edition) Another definition provided is the view that "human reason is incapable of providing sufficient ...
, though these often do involve skeptical attitudes toward religion and philosophical theology (for example, towards divine
omnipotence Omnipotence is the quality of having unlimited power. Monotheistic religions generally attribute omnipotence only to the deity of their faith. In the monotheistic religious philosophy of Abrahamic religions, omnipotence is often listed as one o ...
). Religious people are generally skeptical about claims of other religions, at least when the two denominations conflict concerning some stated belief. Additionally, they may also be skeptical of the claims made by atheists. The historian
Will Durant William James Durant (; November 5, 1885 – November 7, 1981) was an American writer, historian, and philosopher. He became best known for his work '' The Story of Civilization'', which contains 11 volumes and details the history of eastern a ...
writes that
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 ...
was "as skeptical of atheism as of any other dogma". The
Baháʼí Faith The Baháʼí Faith is a religion founded in the 19th century that teaches the Baháʼí Faith and the unity of religion, essential worth of all religions and Baháʼí Faith and the unity of humanity, the unity of all people. Established by ...
encourages skepticism that is mainly centered around self-investigation of truth.


Science

A scientific or
empirical Empirical evidence for a proposition is evidence, i.e. what supports or counters this proposition, that is constituted by or accessible to sense experience or experimental procedure. Empirical evidence is of central importance to the sciences and ...
skeptic is one who questions beliefs on the basis of scientific understanding and empirical evidence.
Scientific Science is a systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earliest archeological evidence for ...
skepticism may discard beliefs pertaining to ''purported phenomena'' not subject to reliable observation and thus not systematic or
testable Testability is a primary aspect of Science and the Scientific Method and is a property applying to an empirical hypothesis, involves two components: #Falsifiability or defeasibility, which means that counterexamples to the hypothesis are logicall ...
empirically. Most scientists, being scientific skeptics, test the reliability of certain kinds of claims by subjecting them to a systematic investigation using some type of the
scientific method The scientific method is an empirical method for acquiring knowledge that has characterized the development of science since at least the 17th century (with notable practitioners in previous centuries; see the article history of scientific m ...
. As a result, a number of claims are considered as "
pseudoscience Pseudoscience consists of statements, beliefs, or practices that claim to be both scientific and factual but are incompatible with the scientific method. Pseudoscience is often characterized by contradictory, exaggerated or falsifiability, unfa ...
", if they are found to improperly apply or ignore the fundamental aspects of the scientific method.


Auditing

Professional skepticism is an important concept in
auditing An audit is an "independent examination of financial information of any entity, whether profit oriented or not, irrespective of its size or legal form when such an examination is conducted with a view to express an opinion thereon.” Auditing ...
. It requires an auditor to have a "questioning mind", to make a critical assessment of evidence, and to consider the sufficiency of the evidence.


See also

*
Critical thinking Critical thinking is the analysis of available facts, evidence, observations, and arguments to form a judgement. The subject is complex; several different definitions exist, which generally include the rational, skeptical, and unbiased analysis ...
*
Debunker A debunker is a person or organization that exposes or discredits claims believed to be false, exaggerated, or pretentious. "to expose or excoriate (a claim, assertion, sentiment, etc.) as being pretentious, false, or exaggerated: to debunk adv ...
(one who claims to expose claims as being false) *
Scientific skepticism Scientific skepticism or rational skepticism (also spelled scepticism), sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence. In practice, the term most commonly refe ...
*
Pseudoskepticism Pseudoskepticism ( also spelled as pseudoscepticism) is a philosophical or scientific position that appears to be that of skepticism or scientific skepticism but in reality is a form of dogmatism. Nineteenth and early twentieth centuries An ea ...
(dogma in the form of skepticism) *
Trivialism Trivialism is the logical theory that all statements (also known as propositions) are true and that all contradictions of the form "p and not p" (e.g. the ball is red and not red) are true. In accordance with this, a trivialist is a person who b ...
(opposite of skepticism) *
List of topics characterized as pseudoscience This is a list of topics that have, either currently or in the past, been characterized as pseudoscience by academics or researchers. Detailed discussion of these topics may be found on their main pages. These characterizations were made in the ...
* ''The Skeptic'' (UK magazine), founded by Wendy M. Grossman, examines secularism and the paranormal *
Committee for Skeptical Inquiry The Committee for Skeptical Inquiry (CSI), formerly known as the Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP), is a program within the US non-profit organization Center for Inquiry (CFI), which seeks to "prom ...
, a non-profit organization to encourage the investigation of paranormal and fringe-science * ''
Skeptical Inquirer ''Skeptical Inquirer'' is a bimonthly American general-audience magazine published by the Committee for Skeptical Inquiry (CSI) with the subtitle: ''The Magazine for Science and Reason''. Mission statement and goals Daniel Loxton, writing in ...
'', magazine published by the
Committee for Skeptical Inquiry The Committee for Skeptical Inquiry (CSI), formerly known as the Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP), is a program within the US non-profit organization Center for Inquiry (CFI), which seeks to "prom ...
*
The Skeptics Society The Skeptics Society is a nonprofit, member-supported organization devoted to promoting scientific skepticism and resisting the spread of pseudoscience, superstition, and irrational beliefs. The Skeptics Society was co-founded by Michael Sh ...
, a nonprofit organization devoted to resisting the spread of pseudoscience, superstition, and irrational beliefs * ''Skeptic'' (U.S. magazine), magazine of The Skeptics Society * ''
Skepticality ''Skepticality'' is the official podcast of The Skeptics Society's ''Skeptic'' magazine. Beginning in May 2005, the podcast explores rational thought, skeptical ideas, and famous myths from around the world and throughout history. Each episode ...
'', a biweekly podcast of the US Skeptics Society's ''Skeptic'' magazine * ''
The Skeptic's Dictionary ''The Skeptic's Dictionary'' is a collection of cross-referenced skeptical essays by Robert Todd Carroll, published on his website skepdic.com and in a printed book. The skepdic.com site was launched in 1994 and the book was published in 2003 wi ...
'', a collection of essays by Robert Todd Carroll *
Skeptical movement Scientific skepticism or rational skepticism (also spelled scepticism), sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence. In practice, the term most commonly refe ...
, a movement based on scientific skepticism, a term introduced by Carl Sagan *
Skeptics in the Pub Skeptics in the Pub (abbreviated SITP) is an informal social event designed to promote fellowship and social networking among skeptics, critical thinkers, freethinkers, rationalists and other like-minded individuals. It provides an opportunity ...
, a social meet-up group *
The Amaz!ng Meeting The Amazing Meeting (TAM), stylized as The Amaz!ng Meeting, was an annual conference that focused on science, skepticism, and critical thinking; it was held for twelve years. The conference started in 2003 and was sponsored by the James Randi Educ ...
, an annual conference on science, skepticism, and critical thinking *
Euroscepticism Euroscepticism, also spelled as Euroskepticism or EU-scepticism, is a political position involving criticism of the European Union (EU) and European integration. It ranges from those who oppose some EU institutions and policies, and seek reform ...
, skepticism and/or opposition towards the European Union and its increasing power


Notes


Sources

* ''
A Greek-English Lexicon A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''aes'' ...
'',
Henry George Liddell Henry George Liddell (; 6 February 1811– 18 January 1898) was dean (1855–1891) of Christ Church, Oxford, Vice-Chancellor of Oxford University (1870–1874), headmaster (1846–1855) of Westminster School (where a house is now named after h ...
and Robert Scott, revised and augmented throughout by Sir
Henry Stuart Jones Sir Henry Stuart Jones, FBA (15 May 1867 – 29 June 1939) was a British academic. He was educated at Balliol College, Oxford; he obtained a First in Classical Moderations in 1888 and a First in Literae Humaniores ('Greats', a combination of ph ...
, with the assistance of Roderick McKenzie,
Clarendon Press Oxford University Press (OUP) is the university press of the University of Oxford. It is the largest university press in the world, and its printing history dates back to the 1480s. Having been officially granted the legal right to print books ...
, Oxford, UK, 1940
Online
perseus.tufts.edu. * Butchvarov, Panayot, ''Skepticism About the External World'' (
Oxford University Press Oxford University Press (OUP) is the university press of the University of Oxford. It is the largest university press in the world, and its printing history dates back to the 1480s. Having been officially granted the legal right to print books ...
, 1998). * *
Richard Hönigswald Richard Hönigswald (18 July 1875 in Magyar-Óvár in the Austro-Hungarian Empire (the present Mosonmagyaróvár in Hungary) – 11 June 1947 in New Haven, Connecticut) was a well-known philosopher belonging to the wider circle of neo-Kantianism ...
, ''Die Skepsis in Philosophie und Wissenschaft'', 1914, new edition (ed. and introduction by Christian Benne and Thomas Schirren), Göttingen: Edition Ruprecht, 2008, * Keeton, Morris T., "skepticism", pp. 277–278 in Dagobert D. Runes (ed.), ''Dictionary of Philosophy'', Littlefield, Adams, and Company, Totowa, NJ, 1962. * * ''Webster's New International Dictionary of the English Language, Second Edition, Unabridged'', W.A. Neilson, T.A. Knott, P.W. Carhart (eds.), G. & C. Merriam Company, Springfield, MA, 1950.


Further reading

* * * * * * * * *


External links

* * * * * * * *
"Most Scientific Papers are Probably Wrong"
, ''
New Scientist ''New Scientist'' is a magazine covering all aspects of science and technology. Based in London, it publishes weekly English-language editions in the United Kingdom, the United States and Australia. An editorially separate organisation publishe ...
'', 30 August 2005
''Classical Skepticism''
by
Peter Suber Peter Dain Suber (born November 8, 1951) is a philosopher specializing in the philosophy of law and open access to knowledge. He is a Senior Researcher at the Berkman Klein Center for Internet & Society, Director of the Harvard Office for Scholarly ...

"Outstanding skeptics of the 20th century"
– ''
Skeptical Inquirer ''Skeptical Inquirer'' is a bimonthly American general-audience magazine published by the Committee for Skeptical Inquiry (CSI) with the subtitle: ''The Magazine for Science and Reason''. Mission statement and goals Daniel Loxton, writing in ...
'' magazine {{Authority control Epistemological theories Philosophical methodology Philosophical schools and traditions Psychological attitude Scientific method Doubt