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Philosophy (from , ) is the systematized study of general and fundamental questions, such as those about existence, reason, knowledge, values,
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 ...
, and language. Such questions are often posed as problems to be studied or resolved. Some sources claim the term was coined by Pythagoras ( BCE), although this theory is disputed by some. Philosophical methods include questioning, critical discussion, rational argument, and systematic presentation. in . Historically, ''philosophy'' encompassed all bodies of knowledge and a practitioner was known as a ''
philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek th ...
''."The English word "philosophy" is first attested to , meaning "knowledge, body of knowledge." " natural philosophy," which began as a discipline in ancient India and Ancient Greece, encompasses astronomy, medicine, and physics. For example,
Newton Newton most commonly refers to: * Isaac Newton (1642–1726/1727), English scientist * Newton (unit), SI unit of force named after Isaac Newton Newton may also refer to: Arts and entertainment * ''Newton'' (film), a 2017 Indian film * Newton ( ...
's 1687 '' Mathematical Principles of Natural Philosophy'' later became classified as a book of physics. In the 19th century, the growth of modern research universities led academic philosophy and other disciplines to
professionalize Professionalization is a social process by which any trade or occupation transforms itself into a true " profession of the highest integrity and competence." The definition of what constitutes a profession is often contested. Professionalization t ...
and specialize. Since then, various areas of investigation that were traditionally part of philosophy have become separate academic disciplines, and namely the social sciences such as psychology, sociology, linguistics, and economics. Today, major subfields of academic philosophy include metaphysics, which is concerned with the fundamental nature of existence and reality; epistemology, which studies the nature of knowledge and belief; ethics, which is concerned with
moral value In ethics and the social sciences, value theory involves various approaches that examine how, why, and to what degree humans value things and whether the object or subject of valuing is a person, idea, object, or anything else. Within philosophy, ...
; and logic, which studies the rules of inference that allow one to derive conclusions from true premises. Other notable subfields include philosophy of religion, philosophy of science, political philosophy, aesthetics, philosophy of language, and philosophy of mind.


Definitions

There is wide agreement that philosophy (from the ancient Greek , phílos: "love"; and , sophía: "wisdom") is characterized by various general features: it is a form of rational inquiry, it aims to be systematic, and it tends to critically reflect on its own methods and presuppositions. But approaches that go beyond such vague characterizations to give a more interesting or profound definition are usually controversial. Often, they are only accepted by theorists belonging to a certain philosophical movement and are revisionistic in that many presumed parts of philosophy would not deserve the title "philosophy" if they were true. Before the modern age, the term was used in a very wide sense, which included the individual sciences, like physics or
mathematics Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics ...
, as its sub-disciplines, but the contemporary usage is more narrow. Some approaches argue that there is a set of essential features shared by all parts of philosophy while others see only weaker family resemblances or contend that it is merely an empty blanket term. Some definitions characterize philosophy in relation to its method, like pure reasoning. Others focus more on its topic, for example, as the study of the biggest patterns of the world as a whole or as the attempt to answer the big questions. Both approaches have the problem that they are usually either too wide, by including non-philosophical disciplines, or too narrow, by excluding some philosophical sub-disciplines. Many definitions of philosophy emphasize its intimate relation to science. In this sense, philosophy is sometimes understood as a proper science in its own right. Some naturalist approaches, for example, see philosophy as an empirical yet very abstract science that is concerned with very wide-ranging empirical patterns instead of particular observations. Some phenomenologists, on the other hand, characterize philosophy as the science of essences. Science-based definitions usually face the problem of explaining why philosophy in its long history has not made the type of progress as seen in other sciences. This problem is avoided by seeing philosophy as an immature or provisional science whose subdisciplines cease to be philosophy once they have fully developed. In this sense, philosophy is the midwife of the sciences. Other definitions focus more on the contrast between science and philosophy. A common theme among many such definitions is that philosophy is concerned with
meaning Meaning most commonly refers to: * Meaning (linguistics), meaning which is communicated through the use of language * Meaning (philosophy), definition, elements, and types of meaning discussed in philosophy * Meaning (non-linguistic), a general te ...
, understanding, or the clarification of language. According to one view, philosophy is conceptual analysis, which involves finding the necessary and sufficient conditions for the application of concepts. Another defines philosophy as a linguistic therapy that aims at dispelling misunderstandings to which humans are susceptible due to the confusing structure of
natural language In neuropsychology, linguistics, and philosophy of language, a natural language or ordinary language is any language that has evolved naturally in humans through use and repetition without conscious planning or premeditation. Natural languages ...
. One more approach holds that the main task of philosophy is to articulate the pre-ontological understanding of the world, which acts as a condition of possibility of experience. Many other definitions of philosophy do not clearly fall into any of the aforementioned categories. An early approach already found in ancient Greek and
Roman philosophy Ancient Roman philosophy was heavily influenced by the ancient Greeks and the schools of Hellenistic philosophy; however, unique developments in philosophical schools of thought occurred during the Roman period as well. Interest in philosophy was ...
is that philosophy is the spiritual practice of developing one's
reasoning Reason is the capacity of consciously applying logic by drawing conclusions from new or existing information, with the aim of seeking the truth. It is closely associated with such characteristically human activities as philosophy, science, lang ...
ability. This practice is an expression of the philosopher's love of wisdom and has the aim of improving one's well-being by leading a reflective life. A closely related approach identifies the development and articulation of worldviews as the principal task of philosophy, i.e. to express how things on the grand scale hang together and which practical stance we should take towards them. Another definition characterizes philosophy as '' thinking about thinking'' in order to emphasize its reflective nature.


Historical overview

In one general sense, philosophy is associated with wisdom, intellectual culture, and a search for knowledge. In this sense, all cultures and literate societies ask philosophical questions, such as "how are we to live" and "what is the nature of reality". A broad and impartial conception of philosophy, then, finds a reasoned inquiry into such matters as reality, morality, and life in all world civilizations.


Western philosophy

Western philosophy is the philosophical tradition of the Western world, dating back to pre-Socratic thinkers who were active in 6th-century Greece (BCE), such as Thales ( BCE) and Pythagoras ( BCE) who practiced a 'love of wisdom' () and were also termed 'students of nature' (). Western philosophy can be divided into three eras: # Ancient (
Greco-Roman The Greco-Roman civilization (; also Greco-Roman culture; spelled Graeco-Roman in the Commonwealth), as understood by modern scholars and writers, includes the geographical regions and countries that culturally—and so historically—were di ...
). # Medieval philosophy (referring to Christian European thought). # Modern philosophy (beginning in the 17th century).


Ancient era

While our knowledge of the ancient era begins with Thales in the 6th century BCE, little is known about the philosophers who came before Socrates (commonly known as
the pre-Socratics Pre-Socratic philosophy, also known as early Greek philosophy, is ancient Greek philosophy before Socrates. Pre-Socratic philosophers were mostly interested in cosmology, the beginning and the substance of the universe, but the inquiries of the ...
). The ancient era was dominated by Greek philosophical schools. Most notable among the schools influenced by Socrates' teachings were Plato, who founded the Platonic Academy, and his student Aristotle, who founded the Peripatetic school. Other ancient philosophical traditions influenced by Socrates included Cynicism, Cyrenaicism,
Stoicism Stoicism is a school of Hellenistic philosophy founded by Zeno of Citium in Athens in the early 3rd century Common Era, BCE. It is a philosophy of personal virtue ethics informed by its system of logic and its views on the natural world, asser ...
, and Academic Skepticism. Two other traditions were influenced by Socrates' contemporary, Democritus:
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 ...
and
Epicureanism Epicureanism is a system of philosophy founded around 307 BC based upon the teachings of the ancient Greek philosopher Epicurus. Epicureanism was originally a challenge to Platonism. Later its main opponent became Stoicism. Few writings by Epi ...
. Important topics covered by the Greeks included metaphysics (with competing theories such as atomism and monism), cosmology, the nature of the well-lived life (''
eudaimonia Eudaimonia (Greek: εὐδαιμονία ; sometimes anglicized as eudaemonia or eudemonia, ) is a Greek word literally translating to the state or condition of 'good spirit', and which is commonly translated as 'happiness' or 'welfare'. In wor ...
''), the possibility of knowledge, and the nature of reason ( logos). With the rise of the Roman empire, Greek philosophy was increasingly discussed in Latin by Romans such as Cicero and Seneca (see
Roman philosophy Ancient Roman philosophy was heavily influenced by the ancient Greeks and the schools of Hellenistic philosophy; however, unique developments in philosophical schools of thought occurred during the Roman period as well. Interest in philosophy was ...
).


Medieval era

Medieval philosophy (5th–16th centuries) took place during the period following the fall of the Western Roman Empire and was dominated by the rise of Christianity; it hence reflects
Judeo-Christian The term Judeo-Christian is used to group Christianity and Judaism together, either in reference to Christianity's derivation from Judaism, Christianity's borrowing of Jewish Scripture to constitute the "Old Testament" of the Christian Bible, or ...
theological concerns while also retaining a continuity with Greco-Roman thought. Problems such as the existence and nature of God, the nature of faith and reason, metaphysics, and the problem of evil were discussed in this period. Some key medieval thinkers include
St. 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 Berber origin and the bishop of Hippo Regius in Numidia, Roman North Afri ...
, Thomas Aquinas, Boethius, Anselm and
Roger Bacon Roger Bacon (; la, Rogerus or ', also '' Rogerus''; ), also known by the scholastic accolade ''Doctor Mirabilis'', was a medieval English philosopher and Franciscan friar who placed considerable emphasis on the study of nature through empiri ...
. Philosophy for these thinkers was viewed as an aid to theology (), and hence they sought to align their philosophy with their interpretation of sacred scripture. This period saw the development of
scholasticism Scholasticism was a medieval school of philosophy that employed a critical organic method of philosophical analysis predicated upon the Aristotelian 10 Categories. Christian scholasticism emerged within the monastic schools that translate ...
, a text critical method developed in medieval universities based on close reading and disputation on key texts. The Renaissance period saw increasing focus on classic Greco-Roman thought and on a robust humanism.


Modern era

Early modern philosophy in the Western world begins with thinkers such as Thomas Hobbes and René Descartes (1596–1650). Following the rise of natural science, modern philosophy was concerned with developing a secular and rational foundation for knowledge and moved away from traditional structures of authority such as religion, scholastic thought and the Church. Major modern philosophers include Spinoza, Leibniz,
Locke Locke may refer to: People *John Locke, English philosopher *Locke (given name) *Locke (surname), information about the surname and list of people Places in the United States *Locke, California, a town in Sacramento County *Locke, Indiana *Locke, ...
, Berkeley,
Hume Hume most commonly refers to: * David Hume (1711–1776), Scottish philosopher Hume may also refer to: People * Hume (surname) * Hume (given name) * James Hume Nisbet (1849–1923), Scottish-born novelist and artist In fiction * Hume, the ...
, and Kant.
19th-century philosophy In the 19th century, the philosophers of the 18th-century Enlightenment began to have a dramatic effect on subsequent developments in philosophy. In particular, the works of Immanuel Kant gave rise to a new generation of German philosophers and ...
(sometimes called late modern philosophy) was influenced by the wider 18th-century movement termed " the Enlightenment", and includes figures such as
Hegel Georg Wilhelm Friedrich Hegel (; ; 27 August 1770 – 14 November 1831) was a German philosopher. He is one of the most important figures in German idealism and one of the founding figures of modern Western philosophy. His influence extends a ...
, a key figure in German idealism; Kierkegaard, who developed the foundations for existentialism; Thomas Carlyle, representative of the great man theory; Nietzsche, a famed anti-Christian;
John Stuart Mill John Stuart Mill (20 May 1806 – 7 May 1873) was an English philosopher, political economist, Member of Parliament (MP) and civil servant. One of the most influential thinkers in the history of classical liberalism, he contributed widely to ...
, who promoted utilitarianism; Karl Marx, who developed the foundations for communism; and the American William James. The 20th century saw the split between
analytic philosophy Analytic philosophy is a branch and tradition of philosophy using analysis, popular in the Western world and particularly the Anglosphere, which began around the turn of the 20th century in the contemporary era in the United Kingdom, United Sta ...
and
continental philosophy Continental philosophy is a term used to describe some philosophers and philosophical traditions that do not fall under the umbrella of analytic philosophy. However, there is no academic consensus on the definition of continental philosophy. Pri ...
, as well as philosophical trends such as phenomenology, existentialism,
logical positivism Logical positivism, later called logical empiricism, and both of which together are also known as neopositivism, is a movement in Western philosophy whose central thesis was the verification principle (also known as the verifiability criterion o ...
, pragmatism and the linguistic turn (see
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 ...
).


Middle Eastern philosophy


Pre-Islamic philosophy

The regions of the Fertile Crescent, Iran and Arabia are home to the earliest known philosophical wisdom literature. According to the assyriologist Marc Van de Mieroop,
Babylonia Babylonia (; Akkadian: , ''māt Akkadī'') was an ancient Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Syria). It emerged as an Amorite-ruled state c. ...
n philosophy was a highly developed system of thought with a unique approach to knowledge and a focus on writing, lexicography, divination, and law. It was also a
bilingual Multilingualism is the use of more than one language, either by an individual speaker or by a group of speakers. It is believed that multilingual speakers outnumber monolingual speakers in the world's population. More than half of all E ...
intellectual culture, based on
Sumerian Sumerian or Sumerians may refer to: *Sumer, an ancient civilization **Sumerian language **Sumerian art **Sumerian architecture **Sumerian literature **Cuneiform script, used in Sumerian writing *Sumerian Records, an American record label based in ...
and Akkadian. Early Wisdom literature from the Fertile Crescent was a genre that sought to instruct people on ethical action, practical living, and virtue through stories and proverbs. In Ancient Egypt, these texts were known as '' sebayt'' ('teachings'), and they are central to our understandings of
Ancient Egyptian philosophy Ancient Egyptian philosophy refers to the philosophical works and beliefs of Ancient Egypt. There is some debate regarding its true scope and nature.Juan José Castillos, Ancient Egyptian Philosophy, RSUE 31, 2014, 29-37. Notable works One Eg ...
. The most well known of these texts is '' The Maxims of Ptahhotep.'' Theology and cosmology were central concerns in Egyptian thought. Perhaps the earliest form of a
monotheistic Monotheism is the belief that there is only one deity, an all-supreme being that is universally referred to as God. Cross, F.L.; Livingstone, E.A., eds. (1974). "Monotheism". The Oxford Dictionary of the Christian Church (2 ed.). Oxford: Oxford ...
theology also emerged in Egypt, with the rise of the Amarna theology (or Atenism) of Akhenaten (14th century BCE), which held that the solar creation deity Aten was the only god. This has been described as a "monotheistic revolution" by egyptologist Jan Assmann, though it also drew on previous developments in Egyptian thought, particularly the "New Solar Theology" based around
Amun-Ra Amun (; also ''Amon'', ''Ammon'', ''Amen''; egy, jmn, reconstructed as (Old Egyptian and early Middle Egyptian) → (later Middle Egyptian) → (Late Egyptian), cop, Ⲁⲙⲟⲩⲛ, Amoun) romanized: ʾmn) was a major ancient Egyptian ...
. These theological developments also influenced the post-Amarna Ramesside theology, which retained a focus on a single creative solar deity (though without outright rejection of other gods, which are now seen as manifestations of the main solar deity). This period also saw the development of the concept of the ''ba'' (soul) and its relation to god.
Jewish philosophy Jewish philosophy () includes all philosophy carried out by Jews, or in relation to the religion of Judaism. Until modern ''Haskalah'' (Jewish Enlightenment) and Jewish emancipation, Jewish philosophy was preoccupied with attempts to reconcile ...
and Christian philosophy are religious-philosophical traditions that developed both in the Middle East and in Europe, which both share certain early Judaic texts (mainly the Tanakh) and monotheistic beliefs. Jewish thinkers such as the Geonim of the Talmudic Academies in Babylonia and Maimonides engaged with Greek and Islamic philosophy. Later Jewish philosophy came under strong Western intellectual influences and includes the works of Moses Mendelssohn who ushered in the Haskalah (the Jewish Enlightenment),
Jewish existentialism Jewish existentialism is a category of work by Jewish authors dealing with existentialist themes and concepts (e.g. debate about the existence of God and the meaning of human existence), and intended to answer theological questions that are importan ...
, and Reform Judaism. The various traditions of Gnosticism, which were influenced by both Greek and Abrahamic currents, originated around the first century and emphasized spiritual knowledge ('' gnosis''). Pre-Islamic Iranian philosophy begins with the work of Zoroaster, one of the first promoters of monotheism and of the
dualism Dualism most commonly refers to: * Mind–body dualism, a philosophical view which holds that mental phenomena are, at least in certain respects, not physical phenomena, or that the mind and the body are distinct and separable from one another ** ...
between good and evil. This dualistic cosmogony influenced later Iranian developments such as Manichaeism,
Mazdakism Mazdakism was an Iranian religion, which was an offshoot of Zoroastrianism. The religion has been called one of the most noteworthy examples of pre-modern communism. The religion was founded in the early Sasanian Empire by Zardusht, a Zoroas ...
, and Zurvanism.


Islamic philosophy

Islamic philosophy is the philosophical work originating in the Islamic tradition and is mostly done in Arabic. It draws from the religion of Islam as well as from Greco-Roman philosophy. After the Muslim conquests, the translation movement (mid-eighth to the late tenth century) resulted in the works of Greek philosophy becoming available in Arabic.
Early Islamic philosophy Early Islamic philosophy or classical Islamic philosophy is a period of intense philosophical development beginning in the 2nd century AH of the Islamic calendar (early 9th century CE) and lasting until the 6th century AH (late 12th century CE) ...
developed the Greek philosophical traditions in new innovative directions. This intellectual work inaugurated what is known as the Islamic Golden Age. The two main currents of early Islamic thought are Kalam, which focuses on Islamic theology, and Falsafa, which was based on Aristotelianism and Neoplatonism. The work of Aristotle was very influential among philosophers such as Al-Kindi (9th century),
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 ...
(980 – June 1037), and Averroes (12th century). Others such as Al-Ghazali were highly critical of the methods of the Islamic Aristotelians and saw their metaphysical ideas as heretical. Islamic thinkers like Ibn al-Haytham and Al-Biruni also developed a scientific method, experimental medicine, a theory of optics, and a legal philosophy.
Ibn Khaldun Ibn Khaldun (; ar, أبو زيد عبد الرحمن بن محمد بن خلدون الحضرمي, ; 27 May 1332 – 17 March 1406, 732-808 AH) was an Arab The Historical Muhammad', Irving M. Zeitlin, (Polity Press, 2007), p. 21; "It is, of ...
was an influential thinker in
philosophy of history Philosophy of history is the philosophical study of history and its discipline. The term was coined by French philosopher Voltaire. In contemporary philosophy a distinction has developed between ''speculative'' philosophy of history and ''crit ...
. Islamic thought also deeply influenced European intellectual developments, especially through the commentaries of Averroes on Aristotle. The Mongol invasions and the destruction of Baghdad in 1258 are often seen as marking the end of the Golden Age. Several schools of Islamic philosophy continued to flourish after the Golden Age, however, and include currents such as Illuminationist philosophy, Sufi philosophy, and Transcendent theosophy. The 19th- and 20th-century Arab world saw the '' Nahda'' movement (literally meaning 'The Awakening'; also known as the 'Arab Renaissance'), which had a considerable influence on contemporary Islamic philosophy.


Eastern philosophy


Indian philosophy

Indian philosophy ( sa, , lit=point of view', 'perspective) refers to the diverse philosophical traditions that emerged since the ancient times on the Indian subcontinent. Indian philosophy chiefly considers epistemology, theories of consciousness and theories of mind, and the physical properties of reality. Indian philosophical traditions share various key concepts and ideas, which are defined in different ways and accepted or rejected by the different traditions. These include concepts such as ''dhárma'', '' karma'', ''
pramāṇa ''Pramana'' (Sanskrit: प्रमाण, ) literally means " proof" and "means of knowledge".duḥkha,
saṃsāra ''Saṃsāra'' (Devanagari: संसार) is a Pali/Sanskrit word that means "world". It is also the concept of rebirth and "cyclicality of all life, matter, existence", a fundamental belief of most Indian religions. Popularly, it is the c ...
'' and ''
mokṣa ''Moksha'' (; sa, मोक्ष, '), also called ''vimoksha'', ''vimukti'' and ''mukti'', is a term in Hinduism, Buddhism, Jainism and Sikhism for various forms of emancipation, enlightenment, liberation, and release. In its soteriologica ...
.'' Some of the earliest surviving Indian philosophical texts are the Upanishads of the
later Vedic period Later may refer to: * Future, the time after the present Television * ''Later'' (talk show), a 1988–2001 American talk show * '' Later... with Jools Holland'', a British music programme since 1992 * ''The Life and Times of Eddie Roberts'', or ...
(1000–500 BCE), which are considered to preserve the ideas of Brahmanism. Indian philosophical traditions are commonly grouped according to their relationship to the Vedas and the ideas contained in them. Jainism and Buddhism originated at the end of the Vedic period, while the various traditions grouped under Hinduism mostly emerged after the Vedic period as independent traditions. Hindus generally classify Indian philosophical traditions as either orthodox ( ''āstika'') or heterodox (''nāstika'') depending on whether they accept the authority of the Vedas and the theories of '' brahman'' and ''ātman'' found therein. The schools which align themselves with the thought of the Upanishads, the so-called "orthodox" or "
Hindu 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 ...
" traditions, are often classified into six '' darśanas'' or philosophies: Sānkhya, Yoga,
Nyāya (Sanskrit: न्याय, ''nyā-yá''), literally meaning "justice", "rules", "method" or "judgment",Vaisheshika, Mimāmsā and Vedānta. The doctrines of the Vedas and Upanishads were interpreted differently by these six schools of Hindu philosophy, with varying degrees of overlap. They represent a "collection of philosophical views that share a textual connection", according to Chadha (2015). They also reflect a tolerance for a diversity of philosophical interpretations within Hinduism while sharing the same foundation. Hindu philosophers of the six orthodox schools developed systems of epistemology ('' pramana'') and investigated topics such as metaphysics, ethics, psychology ('' guṇa''), hermeneutics, and soteriology within the framework of the Vedic knowledge, while presenting a diverse collection of interpretations. The commonly named six orthodox schools were the competing philosophical traditions of what has been called the "Hindu synthesis" of classical Hinduism. There are also other schools of thought which are often seen as "Hindu", though not necessarily orthodox (since they may accept different scriptures as normative, such as the Shaiva Agamas and Tantras), these include different schools of Shavism such as Pashupata, Shaiva Siddhanta, non-dual tantric Shavism (i.e. Trika, Kaula, etc.). The "Hindu" and "Orthodox" traditions are often contrasted with the "unorthodox" traditions (''nāstika,'' literally "those who reject"), though this is a label that is not used by the "unorthodox" schools themselves. These traditions reject the Vedas as authoritative and often reject major concepts and ideas that are widely accepted by the orthodox schools (such as ''Ātman'', ''Brahman'', and ''Īśvara''). These unorthodox schools include Jainism (accepts ''ātman'' but rejects ''Īśvara,'' Vedas and ''Brahman''), Buddhism (rejects all orthodox concepts except rebirth and karma),
Cārvāka Charvaka ( sa, चार्वाक; IAST: ''Cārvāka''), also known as ''Lokāyata'', is an ancient school of Indian materialism. Charvaka holds direct perception, empiricism, and conditional inference as proper sources of knowledge, embrace ...
(materialists who reject even rebirth and karma) and Ājīvika (known for their doctrine of fate).< Jain philosophy is one of the only two surviving "unorthodox" traditions (along with Buddhism). It generally accepts the concept of a permanent soul ('' jiva'') as one of the five '' astikayas'' (eternal, infinite categories that make up the substance of existence). The other four being ''dhárma'', '' adharma'', ''
ākāśa Akasha or Akash (Sanskrit ' ) means space or sky or æther in traditional Indian cosmology, depending on the religion. The term has also been adopted in Western occultism and spiritualism in the late 19th century. In many modern Indo-Aryan lan ...
'' ('space'), and '' pudgala'' ('matter'). Jain thought holds that all existence is cyclic, eternal and uncreated. Some of the most important elements of Jain philosophy are the Jain theory of karma, the doctrine of nonviolence ( ahiṃsā) and the theory of "many-sidedness" or Anēkāntavāda. The '' Tattvartha Sutra'' is the earliest known, most comprehensive and authoritative compilation of Jain philosophy. Major European Quantum Physicists, including Erwin Schrödinger, Werner Heisenberg, Albert Einstein, & Niels Bohr credit the Vedas with giving them the ideas for their experiments.


Buddhist philosophy

Buddhist philosophy begins with the thought of Gautama Buddha (
fl. ''Floruit'' (; abbreviated fl. or occasionally flor.; from Latin for "they flourished") denotes a date or period during which a person was known to have been alive or active. In English, the unabbreviated word may also be used as a noun indicatin ...
between 6th and 4th century BCE) and is preserved in the early Buddhist texts. It originated in the Indian region of Magadha and later spread to the rest of the Indian subcontinent, East Asia, Tibet, Central Asia, and Southeast Asia. In these regions, Buddhist thought developed into different philosophical traditions which used various languages (like
Tibetan Tibetan may mean: * of, from, or related to Tibet * Tibetan people, an ethnic group * Tibetan language: ** Classical Tibetan, the classical language used also as a contemporary written standard ** Standard Tibetan, the most widely used spoken dial ...
, Chinese and Pali). As such, Buddhist philosophy is a trans-cultural and international phenomenon. The dominant Buddhist philosophical traditions in
East Asian East Asia is the eastern region of Asia, which is defined in both geographical and ethno-cultural terms. The modern states of East Asia include China, Japan, Mongolia, North Korea, South Korea, and Taiwan. China, North Korea, South Korea a ...
nations are mainly based on Indian Mahayana Buddhism. The philosophy of the Theravada school is dominant in Southeast Asian countries like
Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...
, Burma and Thailand. Because ignorance to the true nature of things is considered one of the roots of suffering ('' dukkha''), Buddhist philosophy is concerned with epistemology, metaphysics, ethics and psychology. Buddhist philosophical texts must also be understood within the context of meditative practices which are supposed to bring about certain cognitive shifts. Key innovative concepts include the
Four Noble Truths In Buddhism, the Four Noble Truths (Sanskrit: ; pi, cattāri ariyasaccāni; "The four Arya satyas") are "the truths of the Noble Ones", the truths or realities for the "spiritually worthy ones". ''anicca'' (impermanence), and ''anatta">Impermanence">''anicca'' (impermanence), and ''anatta'' (non-self). After the death of the Buddha, various groups began to systematize his main teachings, eventually developing comprehensive philosophical systems termed ''Abhidharma''. Following the Abhidharma schools, Indian Mahayana philosophers such as Nagarjuna and Vasubandhu developed the theories of '' śūnyatā'' ('emptiness of all phenomena') and ''vijñapti-matra'' ('appearance only'), a form of phenomenology or transcendental idealism. The Dignāga school of ''
pramāṇa ''Pramana'' (Sanskrit: प्रमाण, ) literally means " proof" and "means of knowledge".. There were numerous schools, sub-schools, and traditions of Buddhist philosophy in ancient and medieval India. According to Oxford professor of Buddhist philosophy Jan Westerhoff, the major Indian schools from 300 BCE to 1000 CE were: the Mahāsāṃghika tradition (now extinct), the Sthavira schools (such as Sarvāstivāda, Vibhajyavāda and Pudgalavāda) and the Mahayana schools. Many of these traditions were also studied in other regions, like Central Asia and China, having been brought there by Buddhist missionaries. After the disappearance of Buddhism from India, some of these philosophical traditions continued to develop in the Tibetan Buddhist,
East Asian Buddhist East Asian Buddhism or East Asian Mahayana is a collective term for the schools of Mahāyāna Buddhism that developed across East Asia which follow the Chinese Buddhist canon. These include the various forms of Chinese, Japanese, Korean, and Vi ...
and Theravada Buddhist traditions.


East Asian philosophy

East Asian philosophical thought began in
Ancient China The earliest known written records of the history of China date from as early as 1250 BC, from the Shang dynasty (c. 1600–1046 BC), during the reign of king Wu Ding. Ancient historical texts such as the '' Book of Documents'' (early chapte ...
, and Chinese philosophy begins during the Western Zhou Dynasty and the following periods after its fall when the " Hundred Schools of Thought" flourished (6th century to 221 BCE). This period was characterized by significant intellectual and cultural developments and saw the rise of the major philosophical schools of China such as Confucianism (also known as Ruism), Legalism, and Taoism as well as numerous other less influential schools like
Mohism Mohism or Moism (, ) was an ancient Chinese philosophy of ethics and logic, rational thought, and science developed by the academic scholars who studied under the ancient Chinese philosopher Mozi (c. 470 BC – c. 391 BC), embodied in an epony ...
and Naturalism. These philosophical traditions developed metaphysical, political and ethical theories such Tao, Yin and yang,
Ren Ren or REN may refer to: Abbreviations * Orenburg Tsentralny Airport, IATA code REN, civil airport in Russia * Redes Energéticas Nacionais (REN), Portuguese company * Renanthera, abbreviated as Ren, orchid genus * Ringer equivalence number ( ...
and Li. These schools of thought further developed during the Han (206 BCE – 220 CE) and Tang (618–907 CE) eras, forming new philosophical movements like '' Xuanxue'' (also called ''Neo-Taoism''), and Neo-Confucianism. Neo-Confucianism was a syncretic philosophy, which incorporated the ideas of different Chinese philosophical traditions, including Buddhism and Taoism. Neo-Confucianism came to dominate the education system during the Song dynasty (960–1297), and its ideas served as the philosophical basis of the imperial exams for the scholar official class. Some of the most important Neo-Confucian thinkers are the Tang scholars Han Yu and Li Ao as well as the Song thinkers Zhou Dunyi (1017–1073) and Zhu Xi (1130–1200). Zhu Xi compiled the Confucian canon, which consists of the Four Books (the ''
Great Learning The ''Great Learning'' or ''Daxue'' was one of the "Four Books" in Confucianism attributed to one of Confucius' disciples, Zengzi. The ''Great Learning'' had come from a chapter in the ''Book of Rites'' which formed one of the Five Classics. I ...
'', the '' Doctrine of the Mean'', the ''
Analects The ''Analects'' (; ; Old Chinese: '' ŋ(r)aʔ''; meaning "Selected Sayings"), also known as the ''Analects of Confucius'', the ''Sayings of Confucius'', or the ''Lun Yu'', is an ancient Chinese book composed of a large collection of sayings a ...
'' of Confucius, and the ''
Mencius Mencius ( ); born Mèng Kē (); or Mèngzǐ (; 372–289 BC) was a Chinese Confucianism, Confucian Chinese philosophy, philosopher who has often been described as the "second Sage", that is, second to Confucius himself. He is part of Confuc ...
''). The Ming scholar Wang Yangming (1472–1529) is a later but important philosopher of this tradition as well. Buddhism began arriving in China during the Han Dynasty, through a gradual Silk road transmission, and through native influences developed distinct Chinese forms (such as Chan/ Zen) which spread throughout the East Asian cultural sphere. Chinese culture was highly influential on the traditions of other East Asian states, and its philosophy directly influenced
Korean philosophy Korean philosophy focuses on a totality of world view. Some aspects of Shamanism, Buddhism, and Neo-Confucianism were integrated into Korean philosophy. Traditional Korean thought has been influenced by a number of religious and philosophical ...
,
Vietnamese philosophy Vietnamese philosophy includes both traditional Confucian philosophy, Vietnamese local religious traditions, and later philosophy introducing French, Marxist, Catholic and other influences. Confucianism in Vietnam Confucianism entered Vietnam ...
and Japanese philosophy. During later Chinese dynasties like the Ming Dynasty (1368–1644), as well as in the Korean Joseon dynasty (1392–1897), a resurgent Neo-Confucianism led by thinkers such as Wang Yangming (1472–1529) became the dominant school of thought and was promoted by the imperial state. In Japan, the Tokugawa shogunate (1603–1867) was also strongly influenced by Confucian philosophy. Confucianism continues to influence the ideas and worldview of the nations of the Chinese cultural sphere today. In the Modern era, Chinese thinkers incorporated ideas from Western philosophy. Chinese Marxist philosophy developed under the influence of Mao Zedong, while a Chinese pragmatism developed under Hu Shih. The old traditional philosophies also began to reassert themselves in the 20th century. For example, New Confucianism, led by figures such as Xiong Shili, has become quite influential. Likewise, Humanistic Buddhism is a recent modernist Buddhist movement. Modern Japanese thought meanwhile developed under strong Western influences such as the study of Western Sciences ( Rangaku) and the modernist Meirokusha intellectual society, which drew from European enlightenment thought and promoted liberal reforms as well as Western philosophies like Liberalism and Utilitarianism. Another trend in modern Japanese philosophy was the "National Studies" ( Kokugaku) tradition. This intellectual trend sought to study and promote ancient Japanese thought and culture. Kokugaku thinkers such as Motoori Norinaga sought to return to a pure Japanese tradition which they called Shinto that they saw as untainted by foreign elements. During the 20th century, the Kyoto School, an influential and unique Japanese philosophical school, developed from Western phenomenology and Medieval Japanese Buddhist philosophy such as that of Dogen.


African philosophy

African philosophy is philosophy produced by
African people The population of Africa has grown rapidly over the past century and consequently shows a large youth bulge, further reinforced by a low life expectancy of below 50 years in some African countries. Total population as of 2020 is estimated at ...
, philosophy that presents African worldviews, ideas and themes, or philosophy that uses distinct African philosophical methods. Modern African thought has been occupied with Ethnophilosophy, that is, defining the very meaning of African philosophy and its unique characteristics and what it means to be
African African or Africans may refer to: * Anything from or pertaining to the continent of Africa: ** People who are native to Africa, descendants of natives of Africa, or individuals who trace their ancestry to indigenous inhabitants of Africa *** Ethn ...
. During the 17th century,
Ethiopian philosophy Ethiopian philosophy or Abyssinian philosophy is the philosophical corpus of the territories of present-day Ethiopia and Eritrea. Besides via oral tradition, it was preserved early in written form through Ge'ez manuscripts. This philosophy occupi ...
developed a robust literary tradition as exemplified by
Zera Yacob Zara Yaqob ( Ge'ez: ዘርዐ ያዕቆብ; 1399 – 26 August 1468) was Emperor of Ethiopia, and a member of the Solomonic dynasty who ruled under the regnal name Kwestantinos I (Ge'ez: ቈስታንቲኖስ, "Constantine"). He is known for ...
. Another early African philosopher was Anton Wilhelm Amo (–1759) who became a respected philosopher in Germany. Distinct African philosophical ideas include Ujamaa, the Bantu idea of 'Force', Négritude, Pan-Africanism and Ubuntu. Contemporary African thought has also seen the development of Professional philosophy and of Africana philosophy, the philosophical literature of the
African diaspora The African diaspora is the worldwide collection of communities descended from native Africans or people from Africa, predominantly in the Americas. The term most commonly refers to the descendants of the West and Central Africans who were e ...
which includes currents such as black existentialism by African-Americans. Some modern African thinkers have been influenced by Marxism, African-American literature,
Critical theory A critical theory is any approach to social philosophy that focuses on society and culture to reveal, critique and challenge power structures. With roots in sociology and literary criticism, it argues that social problems stem more from soci ...
,
Critical race theory Critical race theory (CRT) is a cross-disciplinary examination, by social and civil-rights scholars and activists, of how laws, social and political movements, and media shape, and are shaped by, social conceptions of race and ethnicity. Goa ...
,
Postcolonialism Postcolonialism is the critical academic study of the cultural, political and economic legacy of colonialism and imperialism, focusing on the impact of human control and exploitation of colonized people and their lands. More specifically, it is a ...
and Feminism.


Indigenous American philosophy

Indigenous-American philosophical thought consists of a wide variety of beliefs and traditions among different American cultures. Among some of U.S. Native American communities, there is a belief in a metaphysical principle called the ' Great Spirit' ( Siouan: '' wakȟáŋ tȟáŋka''; Algonquian: ''gitche manitou''). Another widely shared concept was that of '' orenda'' ('spiritual power'). According to Whiteley (1998), for the Native Americans, "mind is critically informed by transcendental experience (dreams, visions and so on) as well as by reason." The practices to access these transcendental experiences are termed ''
shamanism Shamanism is a religious practice that involves a practitioner (shaman) interacting with what they believe to be a Spirit world (Spiritualism), spirit world through Altered state of consciousness, altered states of consciousness, such as tranc ...
''. Another feature of the indigenous American worldviews was their extension of ethics to non-human animals and plants. In Mesoamerica, Nahua philosophy was an intellectual tradition developed by individuals called ''
tlamatini ''Tlamatini'' (plural ''tlamatinime'') is a Nahuatl language word meaning "someone who knows something", generally translated as "wise man". The word is analyzable as derived from the transitive verb ''mati'' "to know" with the prefix ''tla-'' ...
'' ('those who know something') and its ideas are preserved in various Aztec codices and fragmentary texts. Some of these philosophers are known by name, such as
Nezahualcoyotl Nezahualcoyotl may refer to: * Nezahualcoyotl (tlatoani), the ruler of Texcoco * Ciudad Nezahualcóyotl, a city in the State of Mexico * Nezahualcóyotl metro station, in Mexico City * The Nezahualcóyotl Award, a literary prize in Mexico * Nezah ...
,
Aquiauhtzin Tecayehuatzin (Aquiauhtzin) (1430-1500) was a Nahuatl noble poet born in Ayapango, Mexico. Although a sought-out composer of poetry, few of his poem Poetry (derived from the Greek ''poiesis'', "making"), also called verse, is a form of lit ...
,
Xayacamach Xayacamach of Tizatlan was an Aztec poet from the Pre-Columbian state of Tlaxcallan, born between 1450 and 1455. He was the son of the "Señor de Aztahua de Tizatlan" (Lord of Aztahua of Tizatlan). He took his father's place as governor, and ass ...
, Tochihuitzin coyolchiuhqui and Cuauhtencoztli. These authors were also poets and some of their work has survived in the original
Nahuatl Nahuatl (; ), Aztec, or Mexicano is a language or, by some definitions, a group of languages of the Uto-Aztecan language family. Varieties of Nahuatl are spoken by about Nahua peoples, most of whom live mainly in Central Mexico and have smaller ...
. Aztec philosophers developed theories of metaphysics, epistemology, values, and aesthetics. Aztec ethics was focused on seeking ''tlamatiliztli'' ('knowledge', 'wisdom') which was based on moderation and balance in all actions as in the Nahua proverb "the middle good is necessary". The Nahua worldview posited the concept of an ultimate universal energy or force called '' Ōmeteōtl'' ('Dual Cosmic Energy') which sought a way to live in balance with a constantly changing, "slippery" world. The theory of '' Teotl'' can be seen as a form of Pantheism. According to James Maffie, Nahua metaphysics posited that teotl is "a single, vital, dynamic, vivifying, eternally self-generating and self-conceiving as well as self-regenerating and self-reconceiving sacred energy or force". This force was seen as the all-encompassing life force of the universe and as the universe itself. The Inca civilization also had an elite class of philosopher-scholars termed the ''amawtakuna'' or ''amautas'' who were important in the Inca education system as teachers of philosophy, theology, astronomy, poetry, law, music, morality and history. Young Inca nobles were educated in these disciplines at the state college of Yacha-huasi in Cuzco, where they also learned the art of the quipu. Incan philosophy (as well as the broader category of Andean thought) held that the universe is animated by a single dynamic life force (sometimes termed ''camaquen'' or ''camac'', as well as ''upani'' and ''amaya''). This singular force also arises as a set of dual complementary yet opposite forces. These "complementary opposites" are called
yanantin Yanantin is one of the best known and most defining characteristics of indigenous South American Andean thought and exemplifies Andean adherence to a philosophical model based in what is often referred to as a " dualism of complementary terms" or ...
and masintin. They are expressed as various polarities or dualities (such as male–female, dark–light, life and death, above and below) which interdependently contribute to the harmonious whole that is the universe through the process of reciprocity and mutual exchange called ''ayni''. The Inca worldview also included the belief in a
creator God A creator deity or creator god (often called the Creator) is a deity responsible for the creation of the Earth, world, and universe in human religion and mythology. In monotheism, the single God is often also the creator. A number of monolatris ...
( Viracocha) and reincarnation.


Branches of philosophy

Philosophical questions can be grouped into various branches. These groupings allow philosophers to focus on a set of similar topics and interact with other thinkers who are interested in the same questions. These divisions are neither exhaustive nor mutually exclusive. (A philosopher might specialize in Kantian epistemology, or Platonic aesthetics, or modern political philosophy). Furthermore, these philosophical inquiries sometimes overlap with each other and with other inquiries such as science, religion or mathematics.


Aesthetics

Aesthetics is the "critical reflection on art, culture and nature". It addresses the nature of art, beauty and taste, enjoyment, emotional values, perception and the creation and appreciation of beauty. It is more precisely defined as the study of
sensory Sensory may refer to: Biology * Sensory ecology, how organisms obtain information about their environment * Sensory neuron, nerve cell responsible for transmitting information about external stimuli * Sensory perception, the process of acquiri ...
or sensori-emotional values, sometimes called judgments of sentiment and taste. Its major divisions are art theory,
literary theory Literary theory is the systematic study of the nature of literature and of the methods for literary analysis. Culler 1997, p.1 Since the 19th century, literary scholarship includes literary theory and considerations of intellectual history, mo ...
,
film theory Film theory is a set of scholarly approaches within the academic discipline of film or cinema studies that began in the 1920s by questioning the formal essential attributes of motion pictures; and that now provides conceptual frameworks for und ...
and
music theory Music theory is the study of the practices and possibilities of music. ''The Oxford Companion to Music'' describes three interrelated uses of the term "music theory". The first is the "rudiments", that are needed to understand music notation (ke ...
. An example from art theory is to discern the set of principles underlying the work of a particular artist or artistic movement such as the Cubist aesthetic.


Ethics

Ethics, also known as moral philosophy, studies what constitutes good and bad conduct, right and wrong values, and
good and evil In religion, ethics, philosophy, and psychology "good and evil" is a very common dichotomy. In cultures with Manichaean and Abrahamic religious influence, evil is perceived as the dualistic antagonistic opposite of good, in which good shoul ...
. Its primary investigations include exploring how to live a good life and identifying standards of morality. It also includes investigating whether there ''is'' a best way to live or a universal moral standard, and if so, how we come to learn about it. The main branches of ethics are
normative ethics Normative ethics is the study of ethical behaviour and is the branch of philosophical ethics that investigates the questions that arise regarding how one ought to act, in a moral sense. Normative ethics is distinct from meta-ethics in that the ...
,
meta-ethics In metaphilosophy and ethics, meta-ethics is the study of the nature, scope, and meaning of moral judgment. It is one of the three branches of ethics generally studied by philosophers, the others being normative ethics (questions of how one ought ...
and applied ethics. The three main views in ethics about what constitute moral actions are: * Consequentialism, which judges actions based on their consequences. One such view is utilitarianism, which judges actions based on the net happiness (or pleasure) and/or lack of suffering (or pain) that they produce. * Deontology, which judges actions based on whether they are in accordance with one's moral duty. In the standard form defended by Immanuel Kant, deontology is concerned with whether a choice respects the moral agency of other people, regardless of its consequences. * Virtue ethics, which judges actions based on the moral character of the agent who performs them and whether they conform to what an ideally virtuous agent would do.


Epistemology

Epistemology is the branch of philosophy that studies knowledge. Epistemologists examine putative sources of knowledge, including
perceptual experience Experience refers to Consciousness, conscious events in general, more specifically to perceptions, or to the practical knowledge and familiarity that is produced by these conscious processes. Understood as a conscious event in the widest sense, ex ...
, reason, memory, and testimony. They also investigate questions about the nature of truth, belief,
justification Justification may refer to: * Justification (epistemology), a property of beliefs that a person has good reasons for holding * Justification (jurisprudence), defence in a prosecution for a criminal offenses * Justification (theology), God's act of ...
, and
rationality Rationality is the quality of being guided by or based on reasons. In this regard, a person acts rationally if they have a good reason for what they do or a belief is rational if it is based on strong evidence. This quality can apply to an abil ...
. Philosophical skepticism, which raises doubts about some or all claims to knowledge, has been a topic of interest throughout the history of philosophy. It arose early in
Pre-Socratic philosophy Pre-Socratic philosophy, also known as early Greek philosophy, is ancient Greek philosophy before Socrates. Pre-Socratic philosophers were mostly interested in cosmology, the beginning and the substance of the universe, but the inquiries of thes ...
and became formalized with
Pyrrho 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 ...
, the founder of the earliest Western school of philosophical skepticism. It features prominently in the works of modern philosophers René Descartes and David Hume and has remained a central topic in contemporary epistemological debates. One of the most notable epistemological debates is between
empiricism In philosophy, empiricism is an epistemological theory that holds that knowledge or justification comes only or primarily from sensory experience. It is one of several views within epistemology, along with rationalism and skepticism. Empir ...
and rationalism. Empiricism places emphasis on observational evidence via sensory experience as the source of knowledge. Empiricism is associated with
a posteriori knowledge ("from the earlier") and ("from the later") are Latin phrases used in philosophy to distinguish types of knowledge, justification, or argument by their reliance on empirical evidence or experience. knowledge is independent from current ex ...
, which is obtained through experience (such as scientific knowledge). Rationalism places emphasis on reason as a source of knowledge. Rationalism is associated with
a priori knowledge ("from the earlier") and ("from the later") are Latin phrases used in philosophy to distinguish types of knowledge, justification, or argument by their reliance on empirical evidence or experience. knowledge is independent from current ex ...
, which is independent of experience (such as logic and
mathematics Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics ...
). One central debate in contemporary epistemology is about the conditions required for a belief to constitute knowledge, which might include truth and
justification Justification may refer to: * Justification (epistemology), a property of beliefs that a person has good reasons for holding * Justification (jurisprudence), defence in a prosecution for a criminal offenses * Justification (theology), God's act of ...
. This debate was largely the result of attempts to solve the Gettier problem. Another common subject of contemporary debates is the regress problem, which occurs when trying to offer proof or justification for any belief, statement, or proposition. The problem is that whatever the source of justification may be, that source must either be without justification (in which case it must be treated as an arbitrary foundation for belief), or it must have some further justification (in which case justification must either be the result of
circular reasoning Circular may refer to: * The shape of a circle * ''Circular'' (album), a 2006 album by Spanish singer Vega * Circular letter (disambiguation) ** Flyer (pamphlet), a form of advertisement * Circular reasoning, a type of logical fallacy * Circular ...
, as in coherentism, or the result of an infinite regress, as in infinitism).


Metaphysics

Metaphysics is the study of the most general features of reality, such as existence, time, objects and their properties, wholes and their parts, events, processes and causation and the relationship between
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 ...
and body. Metaphysics includes cosmology, the study of the world in its entirety and ontology, the study of
being In metaphysics, ontology is the philosophical study of being, as well as related concepts such as existence, becoming, and reality. Ontology addresses questions like how entities are grouped into categories and which of these entities exis ...
, along with the philosophy of space and time. A major point of debate is between realism, which holds that there are entities that exist independently of their mental perception, and idealism, which holds that reality is mentally constructed or otherwise immaterial. Metaphysics deals with the topic of identity. Essence is the set of attributes that make an object what it fundamentally is and without which it loses its identity, while accident is a property that the object has, without which the object can still retain its identity. Particulars are objects that are said to exist in space and time, as opposed to
abstract object In metaphysics, the distinction between abstract and concrete refers to a divide between two types of entities. Many philosophers hold that this difference has fundamental metaphysical significance. Examples of concrete objects include plants, hum ...
s, such as numbers, and universals, which are properties held by multiple particulars, such as redness or a gender. The type of existence, if any, of universals and abstract objects is an issue of debate.


Logic

Logic is the study of reasoning and argument.
Deductive reasoning Deductive reasoning is the mental process of drawing deductive inferences. An inference is deductively valid if its conclusion follows logically from its premises, i.e. if it is impossible for the premises to be true and the conclusion to be fals ...
is when, given certain premises, conclusions are unavoidably implied. Rules of inference are used to infer conclusions such as,
modus ponens In propositional logic, ''modus ponens'' (; MP), also known as ''modus ponendo ponens'' (Latin for "method of putting by placing") or implication elimination or affirming the antecedent, is a deductive argument form and rule of inference. ...
, where given "A” and "If A then B", then "B” must be concluded. Because sound reasoning is an essential element of all sciences, social sciences and humanities disciplines, logic became a formal science. Sub-fields include mathematical logic,
philosophical logic Understood in a narrow sense, philosophical logic is the area of logic that studies the application of logical methods to philosophical problems, often in the form of extended logical systems like modal logic. Some theorists conceive philosophical ...
,
modal logic Modal logic is a collection of formal systems developed to represent statements about necessity and possibility. It plays a major role in philosophy of language, epistemology, metaphysics, and natural language semantics. Modal logics extend other ...
, computational logic and non-classical logics. A major question in the philosophy of mathematics is whether mathematical entities are objective and discovered, called mathematical realism, or invented, called mathematical antirealism.


Mind and language

Philosophy of language explores the nature, origins, and use of language. Philosophy of mind explores the nature 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 ...
and its relationship to the body, as typified by disputes between
materialism Materialism is a form of philosophical monism which holds matter to be the fundamental substance in nature, and all things, including mental states and consciousness, are results of material interactions. According to philosophical materiali ...
and
dualism Dualism most commonly refers to: * Mind–body dualism, a philosophical view which holds that mental phenomena are, at least in certain respects, not physical phenomena, or that the mind and the body are distinct and separable from one another ** ...
. In recent years, this branch has become related to cognitive science.


Philosophy of science

The philosophy of science explores the foundations, methods, history, implications and purpose of science. Many of its subdivisions correspond to specific branches of science. For example, philosophy of biology deals specifically with the metaphysical, epistemological and ethical issues in the biomedical and life sciences.


Political philosophy

Political philosophy is the study of government and the relationship of individuals (or families and clans) to communities including the state. It includes questions about justice, law, property and the rights and obligations of the citizen. Political philosophy, ethics, and aesthetics are traditionally linked subjects, under the general heading of value theory as they involve a normative or evaluative aspect.


Philosophy of religion

Philosophy of religion deals with questions that involve religion and religious ideas from a philosophically neutral perspective (as opposed to theology which begins from religious convictions). Traditionally, religious questions were not seen as a separate field from philosophy proper, and the idea of a separate field only arose in the 19th century. Issues include the existence of God, the relationship between reason and faith, questions of religious epistemology, the relationship between religion and science, how to interpret
religious experiences A religious experience (sometimes known as a spiritual experience, sacred experience, or mystical experience) is a subjective experience which is interpreted within a religious framework. The concept originated in the 19th century, as a defens ...
, questions about the possibility of 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 ...
, the
problem of religious language The problem of religious language considers whether it is possible to talk about God meaningfully if the traditional conceptions of God as being incorporeal, infinite, and timeless, are accepted. Because these traditional conceptions of God make ...
and the existence of souls and responses to religious pluralism and diversity.


Metaphilosophy

Metaphilosophy explores the aims, boundaries and methods of philosophy. It is debated as to whether metaphilosophy is a subject that comes prior to philosophy or whether it is inherently part of philosophy.


Other subdivisions

In section thirteen of his ''Lives and Opinions of the Eminent Philosophers'', the oldest surviving history of philosophy (3rd century),
Diogenes Laërtius Diogenes Laërtius ( ; grc-gre, Διογένης Λαέρτιος, ; ) was a biographer of the Ancient Greece, Greek philosophers. Nothing is definitively known about his life, but his surviving ''Lives and Opinions of Eminent Philosophers'' is a ...
presents a three-part division of ancient Greek philosophical inquiry: * Natural philosophy (i.e. physics, from ) was the study of the constitution and processes of transformation in the physical world. *
Moral philosophy Ethics or moral philosophy is a branch of philosophy that "involves systematizing, defending, and recommending concepts of right and wrong behavior".''Internet Encyclopedia of Philosophy'' The field of ethics, along with aesthetics, concerns ma ...
(i.e. ethics, from ) was the study of goodness, right and wrong, justice and virtue. * Metaphysical philosophy (i.e. logic, from ) was the study of existence, causation, God, logic, forms, and other abstract objects. () In ''Against the Logicians'' the Pyrrhonist philosopher
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 ...
detailed the variety of ways in which the ancient Greek philosophers had divided philosophy, noting that this three-part division was agreed to by Plato, Aristotle, Xenocrates, and the Stoics. The Academic Skeptic philosopher Cicero also followed this three-part division. This division is not obsolete, but has changed: ''natural philosophy'' has split into the various natural sciences, especially physics, astronomy,
chemistry Chemistry is the science, scientific study of the properties and behavior of matter. It is a natural science that covers the Chemical element, elements that make up matter to the chemical compound, compounds made of atoms, molecules and ions ...
, biology, and cosmology; ''moral philosophy'' has birthed the social sciences, while still including value theory (e.g. ethics, aesthetics, political philosophy, etc.); and ''metaphysical philosophy'' has given way to formal sciences such as logic,
mathematics Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics ...
and philosophy of science, while still including epistemology, cosmology, etc. For example,
Newton Newton most commonly refers to: * Isaac Newton (1642–1726/1727), English scientist * Newton (unit), SI unit of force named after Isaac Newton Newton may also refer to: Arts and entertainment * ''Newton'' (film), a 2017 Indian film * Newton ( ...
's '' Mathematical Principles of Natural Philosophy'' (1687), since classified as a book of physics, uses the term '' natural philosophy'' as it was understood at the time, encompassing disciplines such as astronomy, medicine and physics that later became associated with the sciences.


Methods of philosophy

Methods of philosophy are ways of conducting philosophical inquiry. They include techniques for arriving at philosophical knowledge and justifying philosophical claims as well as principles used for choosing between competing theories. A great variety of methods has been employed throughout the history of philosophy. Many of them differ significantly from the methods used in the natural sciences in that they do not use experimental data obtained through measuring equipment. The choice of one's method usually has important implications both for how philosophical theories are constructed and for the arguments cited for or against them. This choice is often guided by
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 ...
considerations about what constitutes philosophical
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 ...
, how much support it offers, and how to acquire it. Various disagreements on the level of philosophical theories have their source in methodological disagreements and the discovery of new methods has often had important consequences both for how philosophers conduct their research and for what claims they defend. Some philosophers engage in most of their theorizing using one particular method while others employ a wider range of methods based on which one fits the specific problem investigated best. Methodological skepticism is a prominent method of philosophy. It aims to arrive at absolutely certain first principles by using systematic doubt to determine which principles of philosophy are indubitable. The geometrical method tries to build a comprehensive philosophical system based on a small set of such axioms. It does so with the help of
deductive reasoning Deductive reasoning is the mental process of drawing deductive inferences. An inference is deductively valid if its conclusion follows logically from its premises, i.e. if it is impossible for the premises to be true and the conclusion to be fals ...
to expand the certainty of its axioms to the system as a whole. Phenomenologists seek certain knowledge about the realm of appearances. They do so by suspending their judgments about the external world in order to focus on how things appear independent of their underlying reality, a technique known as
epoché Epoché ( ἐποχή ''epokhē'', "cessation") is an ancient Greek term. In Hellenistic philosophy it is a technical term typically translated as " suspension of judgment" but also as "withholding of assent". In the modern philosophy of Phenomen ...
. Conceptual analysis is a well-known method in
analytic philosophy Analytic philosophy is a branch and tradition of philosophy using analysis, popular in the Western world and particularly the Anglosphere, which began around the turn of the 20th century in the contemporary era in the United Kingdom, United Sta ...
. It aims to clarify the meaning of concepts by analyzing them into their fundamental constituents. Another method often employed in analytic philosophy is based on common sense. It starts with commonly accepted beliefs and tries to draw interesting conclusions from them, which it often employs in a negative sense to criticize philosophical theories that are too far removed from how the average person sees the issue. It is very similar to how ordinary language philosophy tackles philosophical questions by investigating how ordinary language is used. Various methods in philosophy give particular importance to intuitions, i.e. non-inferential impressions about the correctness of specific claims or general principles. For example, they play an important role in thought experiments, which employ counterfactual thinking to evaluate the possible consequences of an imagined situation. These anticipated consequences can then be used to confirm or refute philosophical theories. The method of reflective equilibrium also employs intuitions. It seeks to form a coherent position on a certain issue by examining all the relevant beliefs and intuitions, some of which often have to be deemphasized or reformulated in order to arrive at a coherent perspective. Pragmatists stress the significance of concrete practical consequences for assessing whether a philosophical theory is true or false. Experimental philosophy is of rather recent origin. Its methods differ from most other methods of philosophy in that it tries to answer philosophical questions by gathering empirical data in ways similar to social psychology and the cognitive sciences.


Philosophical progress

Many philosophical debates that began in ancient times are still debated today. British philosopher Colin McGinn claims that no philosophical progress has occurred during that interval. Australian philosopher David Chalmers, by contrast, sees progress in philosophy similar to that in science. Meanwhile,
Talbot Brewer Talbot Brewer is an American philosopher and Professor of Philosophy at the University of Virginia. He is known for his works on moral philosophy. Philosophy Brewer is known for his idea of "dialectical activity," arguing that contemporary mor ...
, professor of philosophy at University of Virginia, argues that "progress" is the wrong standard by which to judge philosophical activity.


Applied and professional philosophy

Some of those who study philosophy become professional philosophers, typically by working as professors who teach, research and write in academic institutions. However, most students of academic philosophy later contribute to law, journalism, religion, sciences, politics, business, or various arts. For example, public figures who have degrees in philosophy include
comedian A comedian or comic is a person who seeks to entertain an audience by making them laugh. This might be through jokes or amusing Amusement is the state of experiencing humorous and entertaining events or situations while the person or a ...
s Steve Martin and
Ricky Gervais Ricky Dene Gervais ( ; born 25 June 1961) is an English comedian, actor, writer, and director. He co-created, co-wrote, and acted in the British television sitcoms ''The Office'' (2001–2003), '' Extras'' (2005–2007), and '' An Idiot Abroad' ...
, filmmaker Terrence Malick, Pope John Paul II, Wikipedia co-founder Larry Sanger, technology entrepreneur Peter Thiel, U.S. Supreme Court Justice
Stephen Breyer Stephen Gerald Breyer ( ; born August 15, 1938) is a retired American lawyer and jurist who served as an associate justice of the U.S. Supreme Court from 1994 until his retirement in 2022. He was nominated by President Bill Clinton, and repl ...
, '' Jeopardy!'' host
Alex Trebek George Alexander Trebek (; July 22, 1940 – November 8, 2020) was a Canadian-American game show host and television personality. He is best known for hosting the syndicated general knowledge quiz game show ''Jeopardy!'' for 37 season ...
, and US vice presidential candidate Carly Fiorina. Curtis White has argued that philosophical tools are essential to humanities, sciences and social sciences. Recent efforts to avail the general public to the work and relevance of philosophers include the million-dollar
Berggruen Prize The Berggruen Prize for Philosophy and Culture is a US$1-million award given each year to a significant individual in the field of philosophy. It is awarded by the Berggruen Institute to "thinkers whose ideas have helped us find direction, wisdo ...
, first awarded to Charles Taylor in 2016. Some philosophers argue that this professionalization has negatively affected the discipline.


Women in philosophy

Although men have generally dominated philosophical discourse, women philosophers have engaged in the discipline throughout history. The list of female philosophers throughout history is vast. Ancient examples include Hipparchia of Maroneia (active ) and
Arete of Cyrene Arete of Cyrene (; el, Ἀρήτη; fl. 5th–4th century BC) was a Cyrenaic philosopher who lived in Cyrene, Libya. She was the daughter of Aristippus of Cyrene. Life and teachings Arete learned philosophy from her father, Aristippus, who had h ...
(active 5th–4th centuries BCE). Some women philosophers were accepted during the medieval and modern eras, but none became part of the Western canon until the 20th and 21st century, when many suggest that
G.E.M. Anscombe Gertrude Elizabeth Margaret Anscombe (; 18 March 1919 – 5 January 2001), usually cited as G. E. M. Anscombe or Elizabeth Anscombe, was a British analytic philosopher. She wrote on the philosophy of mind, philosophy of action, ...
,
Hannah Arendt Hannah Arendt (, , ; 14 October 1906 – 4 December 1975) was a political philosopher, author, and Holocaust survivor. She is widely considered to be one of the most influential political theorists of the 20th century. Arendt was born ...
,
Bell Hooks Gloria Jean Watkins (September 25, 1952December 15, 2021), better known by her pen name bell hooks, was an American author and social activist who was Distinguished Professor in Residence at Berea College. She is best known for her writings on ...
,
Simone de Beauvoir Simone Lucie Ernestine Marie Bertrand de Beauvoir (, ; ; 9 January 1908 – 14 April 1986) was a French existentialist philosopher, writer, social theorist, and feminist activist. Though she did not consider herself a philosopher, and even th ...
, Simone Weil and Susanne Langer entered the canon.
In the early 1800s, some colleges and universities in the UK and the US began admitting women, producing more female academics. Nevertheless, U.S. Department of Education reports from the 1990s indicate that few women ended up in philosophy and that philosophy is one of the least gender-proportionate fields in the humanities, with women making up somewhere between 17% and 30% of philosophy faculty according to some studies."Salary, Promotion, and Tenure Status of Minority and Women Faculty in U.S. Colleges and Universities." National Center for Education Statistics, Statistical Analysis Report, March 2000; U.S. Department of Education, Office of Education Research and Improvement, Report # NCES 2000–173; 1993 National Study of Postsecondary Faculty (NSOPF:93). See also "Characteristics and Attitudes of Instructional Faculty and Staff in the Humanities." National Center For Education Statistics, E.D. Tabs, July 1997. U.S. Department of Education, Office of Education Research and Improvement, Report # NCES 97-973;1993 National Study of Postsecondary Faculty (NSOPF-93). Prominent 21st century philosophers include:
Judith Butler Judith Pamela Butler (born February 24, 1956) is an American philosopher and gender theorist whose work has influenced political philosophy, ethics, and the fields of third-wave feminism, queer theory, and literary theory. In 1993, Butler ...
,
Gayatri Chakravorty Spivak Gayatri Chakravorty Spivak (born 24 February 1942) is an Indian scholar, literary theorist, and feminist critic. She is a University Professor at Columbia University and a founding member of the establishment's Institute for Comparative Lite ...
,
Martha Nussbaum Martha Craven Nussbaum (; born May 6, 1947) is an American philosopher and the current Ernst Freund Distinguished Service Professor of Law and Ethics at the University of Chicago, where she is jointly appointed in the law school and the philosoph ...
, Onora O'Neill, and Nancy Fraser.


See also

* List of important publications in philosophy *
List of years in philosophy The following entries cover events related to the study of philosophy which occurred in the listed year or century. Centuries * 11th century in philosophy * 12th century in philosophy * 13th century in philosophy * 14th century in philosophy * 15 ...
* List of philosophy journals * List of philosophy awards *
List of unsolved problems in philosophy This is a list of some of the major unsolved problems in philosophy. Philosophy of language Counterfactuals A counterfactual statement is a conditional statement with a false antecedent. For example, the statement "If Joseph Swan had not inve ...
* Lists of philosophers * Social theory * Systems theory


References


Notes


Citations


Bibliography

* * * * * * * * * * * * * * * *


Further reading


General introduction

* * Blumenau, Ralph. ''Philosophy and Living''. * Edward Craig (philosopher), Craig, Edward. ''Philosophy: A Very Short Introduction''. * Harrison-Barbet, Anthony, ''Mastering Philosophy''. * Bertrand Russell, Russell, Bertrand.
The Problems of Philosophy
'. * Sinclair, Alistair J. ''What is Philosophy? An Introduction'', 2008, * Elliott Sober, Sober, Elliott. (2001). ''Core Questions in Philosophy: A Text with Readings''. Upper Saddle River, Prentice Hall. * Robert C. Solomon, Solomon, Robert C. ''Big Questions: A Short Introduction to Philosophy''. * Nigel Warburton, Warburton, Nigel. ''Philosophy: The Basics''. * Nagel, Thomas. ''What Does It All Mean? A Very Short Introduction to Philosophy''. * ''Classics of Philosophy (Vols. 1, 2, & 3)'' by Louis P. Pojman * Cottingham, John. Western Philosophy: An Anthology. 2nd ed. Malden, MA: Blackwell Pub., 2008. Print. Blackwell Philosophy Anthologies. * Richard Tarnas, Tarnas, Richard. ''The Passion of the Western Mind: Understanding the Ideas That Have Shaped Our World View''.


Topical introductions


African

* Imbo, Samuel Oluoch. ''An Introduction to African Philosophy.''


Eastern

* ''A Source Book in Indian Philosophy'' by Sarvepalli Radhakrishnan, Charles A. Moore * Hamilton, Sue. ''Indian Philosophy: a Very Short Introduction''. * Kupperman, Joel J. ''Classic Asian Philosophy: A Guide to the Essential Texts''. * Lee, Joe and Powell, Jim. ''Eastern Philosophy For Beginners''. * Smart, Ninian. ''World Philosophies''. * Copleston, Frederick. ''Philosophy in Russia: From Herzen to Lenin and Berdyaev''.


Islamic

* ''Medieval Islamic Philosophical Writings'' edited by Muhammad Ali Khalidi * * *


Historical introductions


General

* First published in Russian as . * Kathleen Higgins, Higgins, Kathleen M. and Robert C. Solomon, Solomon, Robert C. ''A Short History of Philosophy''. * Will Durant, Durant, Will, ''Story of Philosophy: The Lives and Opinions of the World's Greatest Philosophers'', Pocket, 1991, * First published in Russian as .


Ancient

* Knight, Kelvin. ''Aristotelian Philosophy: Ethics and Politics from Aristotle to MacIntyre''.


Medieval

* ''The Phenomenology Reader'' by Dermot Moran, Timothy Mooney * Kim, J. and Ernest Sosa, Ed. (1999). ''Metaphysics: An Anthology''. Blackwell Philosophy Anthologies. Oxford, Blackwell Publishers Ltd. *


Modern and contemporary

* ''The English Philosophers from Bacon to Mill'' by Edwin Arthur * ''European Philosophers from Descartes to Nietzsche'' by Monroe Beardsley * ''Existentialism: Basic Writings (Second Edition)'' by Charles Guignon, Derk Pereboom * Curley, Edwin, ''A Spinoza Reader'', Princeton, 1994, * Alan Bullock, Bullock, Alan, R.B. Woodings, and John Cumming, ''eds''. ''The Fontana Dictionary of Modern Thinkers'', in series, ''Fontana Original[s]''. Hammersmith, Eng.: Fontana Press, 1992 [1983]. xxv, 867 p. * Roger Scruton, Scruton, Roger. ''A Short History of Modern Philosophy''. * ''Contemporary Analytic Philosophy: Core Readings'' by James Baillie * Kwame Anthony Appiah, Appiah, Kwame Anthony. ''Thinking it Through  – An Introduction to Contemporary Philosophy'', 2003, * Critchley, Simon. ''Continental Philosophy: A Very Short Introduction''.


Reference works

* * * ''The Cambridge Dictionary of Philosophy'' by Robert Audi * ''The Routledge Encyclopedia of Philosophy'' (10 vols.) edited by Edward Craig, Luciano Floridi (available online by subscription); or * ''The Concise Routledge Encyclopedia of Philosophy'' edited by Edward Craig (an abridgement) * ; in 1996, a ninth supplemental volume appeared that updated the classic 1967 encyclopedia. * ''International Directory of Philosophy and Philosophers''. Charlottesville, Philosophy Documentation Center. * ''Directory of American Philosophers''. Charlottesville, Philosophy Documentation Center. * ''Routledge History of Philosophy'' (10 vols.) edited by John Marenbon * ''History of Philosophy'' (9 vols.) by Frederick Copleston * ''A History of Western Philosophy'' (5 vols.) by W.T. Jones (philosopher), W.T. Jones * ''History of Italian Philosophy'' (2 vols.) by Eugenio Garin. Translated from Italian and Edited by Giorgio Pinton. Introduction by Leon Pompa. * ''Encyclopaedia of Indian Philosophies'' (8 vols.), edited by Karl H. Potter et al. (first 6 volumes out of print) * ''Indian Philosophy'' (2 vols.) by Sarvepalli Radhakrishnan * ''A History of Indian Philosophy'' (5 vols.) by Surendranath Dasgupta * ''History of Chinese Philosophy'' (2 vols.) by Fung Yu-lan, Derk Bodde * ''Instructions for Practical Living and Other Neo-Confucian Writings by Wang Yang-ming'' by Chan, Wing-tsit * ''Encyclopedia of Chinese Philosophy'' edited by Antonio S. Cua * ''Encyclopedia of Eastern Philosophy and Religion'' by Ingrid Fischer-Schreiber, Franz-Karl Ehrhard, Kurt Friedrichs * ''Companion Encyclopedia of Asian Philosophy'' by Brian Carr, Indira Mahalingam * ''A Concise Dictionary of Indian Philosophy: Sanskrit Terms Defined in English'' by John A. Grimes * ''History of Islamic Philosophy'' edited by Seyyed Hossein Nasr, Oliver Leaman * ''History of Jewish Philosophy'' edited by Daniel H. Frank, Oliver Leaman * ''A History of Russian Philosophy: From the Tenth to the Twentieth Centuries'' by Valerii Aleksandrovich Kuvakin * Ayer, A.J. et al., Ed. (1994) ''A Dictionary of Philosophical Quotations''. Blackwell Reference Oxford. Oxford, Basil Blackwell Ltd. * Blackburn, S., Ed. (1996)''The Oxford Dictionary of Philosophy''. Oxford, Oxford University Press. * Mautner, T., Ed. ''The Penguin Dictionary of Philosophy''. London, Penguin Books. * * Angeles, P.A., Ed. (1992). ''The HarperCollins Dictionary of Philosophy''. New York, Harper Perennial. * * Hoffman, Eric, Ed. (1997) ''Guidebook for Publishing Philosophy''. Charlottesville, Philosophy Documentation Center. * Popkin, R.H. (1999). ''The Columbia History of Western Philosophy''. New York, Columbia University Press. * Bullock, Alan, and Oliver Stallybrass, ''jt. eds''. ''The Harper Dictionary of Modern Thought''. New York: Harper & Row, 1977. xix, 684 p. ''N.B''.: "First published in England under the title, ''The Fontana Dictionary of Modern Thought''." * William L. Reese, Reese, W.L. ''Dictionary of Philosophy and Religion: Eastern and Western Thought''. Atlantic Highlands, N.J.: Humanities Press, 1980. iv, 644 p.


External links


''Stanford Encyclopedia of Philosophy''

The ''Internet Encyclopedia of Philosophy''

Indiana Philosophy Ontology Project

PhilPapers
– a comprehensive directory of online philosophical articles and books by academic philosophers *
Philosophy (review)

Philosophy Documentation Center

Popular Philosophy
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