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The Philosophy Portal

A portal for Wikipedia's philosophy resources • 17,674 articles in English

Left to right: Plato, Kant, Nietzsche, Buddha, Confucius, Averroes

Philosophy (love of wisdom in ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its own methods and assumptions.

Historically, many of the individual sciences, like physics and psychology, formed part of philosophy. But they are considered separate academic disciplines in the modern sense of the term. The main traditions in the history of philosophy include Western, Arabic-Persian, Indian, and Chinese philosophy. Western philosophy originated in Ancient Greece and covers a wide area of philosophical subfields. A central topic in Arabic-Persian philosophy is the relation between reason and revelation. Indian philosophy combines the spiritual problem of how to reach enlightenment with the exploration of the nature of reality and the ways of arriving at knowledge. Chinese philosophy focuses on practical issues in relation to right social conduct, government, and self-cultivation.

Major branches of philosophy are epistemology, ethics, logic, and metaphysics. Epistemology studies what knowledge is and how to acquire it. Ethics investigates moral principles and what constitutes right conduct. Logic is the study of correct reasoning and explores how good arguments can be distinguished from bad ones. Metaphysics examines the most general features of reality, existence, objects, and properties. Other notable subfields are aesthetics, philosophy of language, philosophy of mind, philosophy of religion, philosophy of science, philosophy of history, and political philosophy.

Philosophers use a great variety of methods to arrive at philosophical knowledge. They include conceptual analysis, reliance on common sense and intuitions, use of thought experiments, analysis of ordinary language, description of experience, and critical questioning. Philosophy is related to many other fields, like the sciences, mathematics, business, law, and journalism. It provides an interdisciplinary perspective and studies their scope and fundamental concepts. It also investigates their methods and ethical implications. (Full article...)

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Putnam in 2006

Hilary Whitehall Putnam (/ˈpʌtnəm/; July 31, 1926 – March 13, 2016) was an American philosopher, mathematician, and computer scientist, and a major figure in analytic philosophy in the second half of the 20th century. He made significant contributions to philosophy of mind, philosophy of language, philosophy of mathematics, and philosophy of science. Outside philosophy, Putnam contributed to mathematics and computer science. Together with Martin Davis he developed the Davis–Putnam algorithm for the Boolean satisfiability problem and he helped demonstrate the unsolvability of Hilbert's tenth problem.

Putnam was known for his willingness to apply equal scrutiny to his own philosophical positions as to those of others, subjecting each position to rigorous analysis until he exposed its flaws. As a result, he acquired a reputation for frequently changing his positions. In philosophy of mind, Putnam is known for his argument against the type-identity of mental and physical states based on his hypothesis of the multiple realizability of the mental, and for the concept of functionalism, an influential theory regarding the mind–body problem. In philosophy of language, along with Saul Kripke and others, he developed the causal theory of reference, and formulated an original theory of meaning, introducing the notion of semantic externalism based on a thought experiment called Twin Earth. (Full article...)
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Portrait, c. 1910

Billings Learned Hand (/ˈlɜːrnɪd/ LURN-id; January 27, 1872 – August 18, 1961) was an American jurist, lawyer, and judicial philosopher. He served as a federal trial judge on the U.S. District Court for the Southern District of New York from 1909 to 1924 and as a federal appellate judge on the U.S. Court of Appeals for the Second Circuit from 1924 to 1951.

Born and raised in Albany, New York, Hand majored in philosophy at Harvard College and graduated with honors from Harvard Law School. After a relatively undistinguished career as a lawyer in Albany and New York City, he was appointed at the age of 37 as a Manhattan federal district judge in 1909. The profession suited his detached and open-minded temperament, and his decisions soon won him a reputation for craftsmanship and authority. Between 1909 and 1914, under the influence of Herbert Croly's social theories, Hand supported New Nationalism. He ran unsuccessfully as the Progressive Party's candidate for chief judge of the New York Court of Appeals in 1913, but withdrew from active politics shortly afterwards. In 1924, President Calvin Coolidge elevated Hand to the Court of Appeals for the Second Circuit, which he went on to lead as the senior circuit judge (later retitled chief judge) from 1939 until his semi-retirement in 1951. Scholars have recognized the Second Circuit under Hand as one of the finest appeals courts in American history. Friends and admirers often lobbied for Hand's promotion to the Supreme Court, but circumstances and his political past conspired against his appointment. (Full article...)
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Wollstonecraft c. 1797

Mary Wollstonecraft (/ˈwʊlstənkræft/, also UK: /-krɑːft/; 27 April 1759 – 10 September 1797) was a British writer, philosopher, and advocate of women's rights. Until the late 20th century, Wollstonecraft's life, which encompassed several unconventional personal relationships at the time, received more attention than her writing. Today Wollstonecraft is regarded as one of the founding feminist philosophers, and feminists often cite both her life and her works as important influences.

During her brief career she wrote novels, treatises, a travel narrative, a history of the French Revolution, a conduct book, and a children's book. Wollstonecraft is best known for A Vindication of the Rights of Woman (1792), in which she argues that women are not naturally inferior to men but appear to be only because they lack education. She suggests that both men and women should be treated as rational beings and imagines a social order founded on reason. (Full article...)
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A Vindication of the Rights of Woman: with Strictures on Political and Moral Subjects (1792), written by British philosopher and women's rights advocate Mary Wollstonecraft (1759–1797), is one of the earliest works of feminist philosophy. In it, Wollstonecraft responds to those educational and political theorists of the eighteenth century who did not believe women should receive a rational education. She argues that women ought to have an education commensurate with their position in society, claiming that women are essential to the nation because they educate its children and because they could be "companions" to their husbands, rather than mere wives. Instead of viewing women as ornaments to society or property to be traded in marriage, Wollstonecraft maintains that they are human beings deserving of the same fundamental rights as men.

Wollstonecraft was prompted to write the Rights of Woman after reading Charles Maurice de Talleyrand-Périgord's 1791 report to the French National Assembly, which stated that women should only receive domestic education. From her reaction to this specific event, she launched a broad attack against double standards, indicting men for encouraging women to indulge in excessive emotion. Wollstonecraft hurried to complete the work in direct response to ongoing events; she intended to write a more thoughtful second volume but died before completing it. (Full article...)
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Portrait by Pavel Zhukov, 1920

Vladimir Ilyich Ulyanov (22 April [O.S. 10 April] 1870 – 21 January 1924), better known as Vladimir Lenin, was a Russian revolutionary, politician, and political theorist. He served as the first and founding head of government of Soviet Russia from 1917 to 1924 and of the Soviet Union from 1922 to 1924. Under his administration, Russia, and later the Soviet Union, became a one-party socialist state governed by the Communist Party. Ideologically a Marxist, his developments to the ideology are called Leninism.

Born to an upper-middle-class family in Simbirsk, Lenin embraced revolutionary socialist politics following his brother's 1887 execution. Expelled from Kazan Imperial University for participating in protests against the Russian Empire's Tsarist government, he devoted the following years to a law degree. He moved to Saint Petersburg in 1893 and became a senior Marxist activist. In 1897, he was arrested for sedition and exiled to Shushenskoye in Siberia for three years, where he married Nadezhda Krupskaya. After his exile, he moved to Western Europe, where he became a prominent theorist in the Marxist Russian Social Democratic Labour Party (RSDLP). In 1903, he took a key role in the RSDLP ideological split, leading the Bolshevik faction against Julius Martov's Mensheviks. Following Russia's failed Revolution of 1905, he campaigned for the First World War to be transformed into a Europe-wide proletarian revolution, which, as a Marxist, he believed would cause the overthrow of capitalism and its replacement with socialism. After the 1917 February Revolution ousted the Tsar and established a Provisional Government, he returned to Russia to play a leading role in the October Revolution in which the Bolsheviks overthrew the new regime. (Full article...)
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A stamp of Zhang Heng issued by China Post in 1955

Zhang Heng (Chinese: 張衡; AD 78–139), formerly romanized as Chang Heng, was a Chinese polymathic scientist and statesman who lived during the Han dynasty. Educated in the capital cities of Luoyang and Chang'an, he achieved success as an astronomer, mathematician, seismologist, hydraulic engineer, inventor, geographer, cartographer, ethnographer, artist, poet, philosopher, politician, and literary scholar.

Zhang Heng began his career as a minor civil servant in Nanyang. Eventually, he became Chief Astronomer, Prefect of the Majors for Official Carriages, and then Palace Attendant at the imperial court. His uncompromising stance on historical and calendrical issues led to his becoming a controversial figure, preventing him from rising to the status of Grand Historian. His political rivalry with the palace eunuchs during the reign of Emperor Shun (r. 125–144) led to his decision to retire from the central court to serve as an administrator of Hejian Kingdom in present-day Hebei. Zhang returned home to Nanyang for a short time, before being recalled to serve in the capital once more in 138. He died there a year later, in 139. (Full article...)
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Augustine of Hippo (AD 354–430) as painted by Sandro Botticelli (c. 1445–1510). Augustine is credited with developing the first form of the theodicy now named for him.

The Augustinian theodicy, named for the 4th- and 5th-century theologian and philosopher Augustine of Hippo, is a type of Christian theodicy that developed in response to the evidential problem of evil. As such, it attempts to explain the probability of an omnipotent (all-powerful) and omnibenevolent (all-loving) God amid evidence of evil in the world. A number of variations of this kind of theodicy have been proposed throughout history; their similarities were first described by the 20th-century philosopher John Hick, who classified them as "Augustinian". They typically assert that God is perfectly (ideally) good, that he created the world out of nothing, and that evil is the result of humanity's original sin. The entry of evil into the world is generally explained as consequence of original sin and its continued presence due to humans' misuse of free will and concupiscence. God's goodness and benevolence, according to the Augustinian theodicy, remain perfect and without responsibility for evil or suffering.

Augustine of Hippo was the first to develop the theodicy. He rejected the idea that evil exists in itself, instead regarding it as a corruption of goodness, caused by humanity's abuse of free will. Augustine believed in the existence of a physical Hell as a punishment for sin, but argued that those who choose to accept the salvation of Jesus Christ will go to Heaven. In the 13th century, Thomas Aquinas – influenced by Augustine – proposed a similar theodicy based on the view that God is goodness and that there can be no evil in him. He believed that the existence of goodness allows evil to exist, through the fault of humans. Augustine also influenced John Calvin, who supported Augustine's view that evil is the result of free will and argued that sin corrupts humans, requiring God's grace to give moral guidance. (Full article...)
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Anonymous portrait, c. 1550

John Calvin (/ˈkælvɪn/; Middle French: Jehan Cauvin; French: Jean Calvin [ʒɑ̃ kalvɛ̃]; 10 July 1509 – 27 May 1564) was a French theologian, pastor and reformer in Geneva during the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism, including its doctrines of predestination and of God's absolute sovereignty in the salvation of the human soul from death and eternal damnation. Calvinist doctrines were influenced by and elaborated upon the Augustinian and other Christian traditions. Various Congregational, Reformed and Presbyterian churches, which look to Calvin as the chief expositor of their beliefs, have spread throughout the world.

Calvin was a tireless polemicist and apologetic writer who generated much controversy. He also exchanged cordial and supportive letters with many reformers, including Philipp Melanchthon and Heinrich Bullinger. In addition to his seminal Institutes of the Christian Religion, Calvin wrote commentaries on most books of the Bible, confessional documents, and various other theological treatises. (Full article...)
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1897 illustration of La Peau de chagrin, drawn by Adrien Moreau and published by George Barrie & Son

La Peau de chagrin (French pronunciation: [la po də ʃaɡʁɛ̃], The Skin of Shagreen), known in English as The Magic Skin and The Wild Ass's Skin, is an 1831 novel by French novelist and playwright Honoré de Balzac (1799–1850). Set in early 19th-century Paris, it tells the story of a young man who finds a magic piece of shagreen (untanned skin from a wild ass) that fulfills his every desire. For each wish granted, however, the skin shrinks and consumes a portion of his physical energy. La Peau de chagrin belongs to the Études philosophiques group of Balzac's sequence of novels, La Comédie humaine.

Before the book was completed, Balzac created excitement about it by publishing a series of articles and story fragments in several Parisian journals. Although he was five months late in delivering the manuscript, he succeeded in generating sufficient interest that the novel sold out instantly upon its publication. A second edition, which included a series of twelve other "philosophical tales", was released one month later. (Full article...)
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Bust of Shen at the Beijing Ancient Observatory

Shen Kuo (Chinese: 沈括; 1031–1095) or Shen Gua, courtesy name Cunzhong (存中) and pseudonym Mengqi (now usually given as Mengxi) Weng (夢溪翁), was a Chinese polymath, scientist, and statesman of the Song dynasty (960–1279). Shen was a master in many fields of study including mathematics, optics, and horology. In his career as a civil servant, he became a finance minister, governmental state inspector, head official for the Bureau of Astronomy in the Song court, Assistant Minister of Imperial Hospitality, and also served as an academic chancellor. At court his political allegiance was to the Reformist faction known as the New Policies Group, headed by Chancellor Wang Anshi (1021–1085).

In his Dream Pool Essays or Dream Torrent Essays (夢溪筆談; Mengxi Bitan) of 1088, Shen was the first to describe the magnetic needle compass, which would be used for navigation (first described in Europe by Alexander Neckam in 1187). Shen discovered the concept of true north in terms of magnetic declination towards the north pole, with experimentation of suspended magnetic needles and "the improved meridian determined by Shen's [astronomical] measurement of the distance between the pole star and true north". This was the decisive step in human history to make compasses more useful for navigation, and may have been a concept unknown in Europe for another four hundred years (evidence of German sundials made circa 1450 show markings similar to Chinese geomancers' compasses in regard to declination). (Full article...)
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Wallace in 1895

Alfred Russel Wallace (8 January 1823 – 7 November 1913) was an English naturalist, explorer, geographer, anthropologist, biologist and illustrator. He independently conceived the theory of evolution through natural selection; his 1858 paper on the subject was published that year alongside extracts from Charles Darwin's earlier writings on the topic. It spurred Darwin to set aside the "big species book" he was drafting and quickly write an abstract of it, which was published in 1859 as On the Origin of Species.

Wallace did extensive fieldwork, starting in the Amazon River basin. He then did fieldwork in the Malay Archipelago, where he identified the faunal divide now termed the Wallace Line, which separates the Indonesian archipelago into two distinct parts: a western portion in which the animals are largely of Asian origin, and an eastern portion where the fauna reflect Australasia. He was considered the 19th century's leading expert on the geographical distribution of animal species, and is sometimes called the "father of biogeography", or more specifically of zoogeography. (Full article...)
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Goldman, c. 1911

Emma Goldman (June 27, 1869 – May 14, 1940) was a Russian-born anarchist, political activist, and writer. She played a pivotal role in the development of anarchist political philosophy in North America and Europe in the first half of the 20th century.

Born in Kaunas, Lithuania (then within the Russian Empire), to an Orthodox Lithuanian Jewish family, Goldman emigrated to the United States in 1885. Attracted to anarchism after the Chicago Haymarket affair, Goldman became a writer and a renowned lecturer on anarchist philosophy, women's rights, and social issues, attracting crowds of thousands. She and anarchist writer Alexander Berkman, her lover and lifelong friend, planned to assassinate industrialist and financier Henry Clay Frick as an act of propaganda of the deed. Frick survived the attempt on his life in 1892, and Berkman was sentenced to 22 years in prison. Goldman was imprisoned several times in the years that followed, for "inciting to riot" and illegally distributing information about birth control. In 1906, Goldman founded the anarchist journal Mother Earth. (Full article...)
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Political Animals and Animal Politics is a 2014 edited collection published by Palgrave Macmillan and edited by the green political theorists Marcel Wissenburg and David Schlosberg. The work addresses the emergence of academic animal ethics informed by political philosophy as opposed to moral philosophy. It was the first edited collection to be published on the topic, and the first book-length attempt to explore the breadth and boundaries of the literature. As well as a substantial introduction by the editors, it features ten sole-authored chapters split over three parts, respectively concerning institutional change for animals, the relationship between animal ethics and ecologism, and real-world laws made for the benefit of animals. The book's contributors were Wissenburg, Schlosberg, Manuel Arias-Maldonado, Chad Flanders, Christie Smith, Clemens Driessen, Simon Otjes, Kurtis Boyer, Per-Anders Svärd, and Mihnea Tanasescu. The focus of their individual chapters varies, but recurring features include discussions of human exceptionalism, exploration of ways that animal issues are or could be present in political discourse, and reflections on the relationship between theory and practice in politics.

In part, Political Animals and Animal Politics arose from a workshop that Wissenburg and Schlosberg organised at the 2012 European Consortium for Political Research Joint Sessions conference, though not all attendees contributed to the volume and not all contributors presented at the workshop. Footage of the workshop appeared in De Haas in de Marathon (The Pacer in the Marathon), a 2012 documentary about the Dutch Party for the Animals. Political Animals and Animal Politics was published as part of the Palgrave Macmillan Animal Ethics Series, edited by Andrew Linzey and Priscilla Cohn. (Full article...)
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Confirmation bias is the tendency to search for, interpret, favor, and recall information in a way that confirms or supports one's prior beliefs or values. People display this bias when they select information that supports their views, ignoring contrary information, or when they interpret ambiguous evidence as supporting their existing attitudes. The effect is strongest for desired outcomes, for emotionally charged issues, and for deeply entrenched beliefs. Confirmation bias cannot be eliminated, but it can be managed, for example, by education and training in critical thinking skills.

Biased search for information, biased interpretation of this information, and biased memory recall, have been invoked to explain four specific effects:
1. attitude polarization (when a disagreement becomes more extreme even though the different parties are exposed to the same evidence)
2. belief perseverance (when beliefs persist after the evidence for them is shown to be false)
3. the irrational primacy effect (a greater reliance on information encountered early in a series)
4. illusory correlation (when people falsely perceive an association between two events or situations).
(Full article...)
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Portrait of Priestley, 1801

Joseph Priestley (/ˈpriːstli/; 24 March 1733 – 6 February 1804) was an English chemist, natural philosopher, separatist theologian, grammarian, multi-subject educator, and liberal political theorist. He published over 150 works, and conducted experiments in several areas of science.

Priestley is credited with his independent discovery of oxygen by the thermal decomposition of mercuric oxide, having isolated it in 1774. During his lifetime, Priestley's considerable scientific reputation rested on his invention of carbonated water, his writings on electricity, and his discovery of several "airs" (gases), the most famous being what Priestley dubbed "dephlogisticated air" (oxygen). Priestley's determination to defend phlogiston theory and to reject what would become the chemical revolution eventually left him isolated within the scientific community. (Full article...)

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... that veterinarian Matt Brash treated some of the owls that appeared in the first Harry Potter film and concluded that they had leukocytozoonosis?
... that the Correspondence of Paul and Seneca was cited in the Middle Ages to claim that Seneca, a Roman philosopher of Stoicism, had converted to Christianity?
... that the essay "In Praise of Polytheism" dismisses all similarities between Enlightenment philosophy and striptease?
... that Lee M. Hollander pioneered the translation of the works of the Danish philosopher Søren Kierkegaard into English?
... that the book Working from Within details how W. V. Quine only began to use the term "naturalism" years after he had already developed the key tenets of the philosophy?
... that in his book Thematic Origins of Scientific Thought: Kepler to Einstein, Gerald Holton argues that philosophy from Either/Or influenced Niels Bohr's concept of complementarity?
... that some philosophers of mathematics believe that the life cycle of a species of cicadas is a good argument for the existence of numbers?
... that one reviewer for Women Philosophers in the Long Nineteenth Century was let down by the book's lack of poetry?

Selected philosopher of the week

Georg Wilhelm Friedrich Hegel (German pronunciation: [ˈɡeɔʁk ˈvɪlhɛlm ˈfʁiːdʁɪç ˈheːɡəl]) (August 27, 1770 – November 14, 1831) was a German philosopher born in Stuttgart, Württemberg, in present-day southwest Germany. His influence has been widespread on writers of widely varying positions, including both his admirers (F. H. Bradley, Sartre, Hans Küng, Bruno Bauer), and his detractors (Kierkegaard, Schopenhauer, Heidegger, Schelling). His great achievement was to introduce for the first time in philosophy the idea that History and the concrete are important in getting out of the circle of philosophia perennis, i.e., the perennial problems of philosophy. He was also the one who, for the first time in the history of philosophy, realised the importance of the Other in the coming to be of self-consciousness...

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Selected article of the week

Irreligion or irreligiousness is an umbrella term which, depending on context, may be understood as referring to atheism, agnosticism, deism, skepticism, freethought, secular humanism or heresy.^{[citation needed]}

Irreligion has at least three related yet distinct meanings:

lack of religion (either due to a lack of information about religion or to lack of belief in it)
hostility to religion
behaving in such a way that fails to live up to one's religious tenets

Although people classified as irreligious might not follow any religion, they do not necessarily lack belief in the supernatural or in deities; such a person may be a non-religious or non-practicing theist. In particular, those who associate organized religion with negative qualities are likely to hold spiritual beliefs but describe themselves as irreligious.

The percentage of people who are irreligious is...

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Title page of a Song dynasty (c. 1100) edition of the I Ching

The I Ching or Yi Jing (Chinese: 易經, Mandarin: [î tɕíŋ] ), usually translated as Book of Changes or Classic of Changes, is an ancient Chinese divination text that is among the oldest of the Chinese classics. Originally a divination manual in the Western Zhou period (1000–750 BC), the I Ching was transformed over the course of the Warring States and early imperial periods (500–200 BC) into a cosmological text with a series of philosophical commentaries known as the "Ten Wings". After becoming part of the Five Classics in the 2nd century BC, the I Ching was the subject of scholarly commentary and the basis for divination practice for centuries across the Far East, and eventually took on an influential role in Western understanding of East Asian philosophical thought.

As a divination text, the I Ching is used for a traditional Chinese form of cleromancy known as I Ching divination, in which bundles of yarrow stalks are manipulated to produce sets of six apparently random numbers ranging from 6 to 9. Each of the 64 possible sets corresponds to a hexagram, which can be looked up in the I Ching. The hexagrams are arranged in an order known as the King Wen sequence. The interpretation of the readings found in the I Ching has been discussed and debated over the centuries. Many commentators have used the book symbolically, often to provide guidance for moral decision-making, as informed by Confucianism, Taoism and Buddhism. The hexagrams themselves have often acquired cosmological significance and been paralleled with many other traditional names for the processes of change such as yin and yang and Wu Xing. (Full article...)
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Kantian ethics refers to a deontological ethical theory developed by German philosopher Immanuel Kant that is based on the notion that: "It is impossible to think of anything at all in the world, or indeed even beyond it, that could be considered good without limitation except a good will." The theory was developed in the context of Enlightenment rationalism. It states that an action can only be moral if (i) it is motivated by a sense of duty and (ii) its maxim may be rationally willed a universal, objective law.

Central to Kant's theory of the moral law is the categorical imperative. Kant formulated the categorical imperative in various ways. His principle of universalizability requires that, for an action to be permissible, it must be possible to apply it to all people without a contradiction occurring. Kant's formulation of humanity, the second formulation of the categorical imperative, states that as an end in itself, humans are required never to treat others merely as a means to an end, but always as ends in themselves. The formulation of autonomy concludes that rational agents are bound to the moral law by their own will, while Kant's concept of the Kingdom of Ends requires that people act as if the principles of their actions establish a law for a hypothetical kingdom. (Full article...)
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Photograph by John Mayall, 1875

Karl Marx (German: [maʁks]; 5 May 1818 – 14 March 1883) was a German-born philosopher, economist, political theorist, historian, sociologist, journalist, and revolutionary socialist. His best-known works are the 1848 pamphlet The Communist Manifesto (with Friedrich Engels) and the three-volume Das Kapital (1867–1894); the latter employs his theory of historical materialism in an analysis of capitalism, representing his greatest intellectual achievement. Marx's ideas and theories and their subsequent development, collectively known as Marxism, have exerted enormous influence on modern intellectual, economic, and political history.

Born in Trier in the Kingdom of Prussia, German Confederation, Marx studied at the universities of Bonn, Berlin, and Jena, and received a doctorate in philosophy from the latter in 1841. A Young Hegelian, he was influenced by the philosophy of Georg Wilhelm Friedrich Hegel, and both critiqued and developed Hegel's ideas in works such as The German Ideology (written 1846) and the Grundrisse (written 1857–1858). While in Paris in 1844, Marx wrote his Economic and Philosophic Manuscripts and met Engels, a lifelong friend and collaborator. After moving to Brussels in 1845, they were active in the Communist League, and in 1848 wrote The Communist Manifesto, which expresses Marx's ideas and ends with a call for revolution: "Working men of all countries, unite!" Marx was expelled from Belgium and Germany, and in 1849 moved to London, where he wrote The Eighteenth Brumaire of Louis Bonaparte (1852) and Das Kapital. In 1864, Marx helped found the International Workingmen's Association (First International), in which he sought to fight the influence of anarchists led by Mikhail Bakunin. In his Critique of the Gotha Programme (1875), Marx wrote on revolution, the transition to communism, and the state. He died stateless in 1883 and was buried in Highgate Cemetery. (Full article...)
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The Butterfly Dream, by Chinese painter Lu Zhi (c. 1550)

The Zhuangzi (Chinese: 莊子, historically romanized Chuang Tzŭ) is an ancient Chinese text from the late Warring States period (476–221 BC) containing stories and anecdotes that exemplify the carefree nature of the ideal Taoist sage. Named for its traditional author, "Master Zhuang" (Zhuangzi), the Zhuangzi is one of the two foundational texts of Taoism, along with the Tao Te Ching.

The Zhuangzi consists of a large collection of anecdotes, allegories, parables, and fables that are often humorous or irreverent. Its main themes are of spontaneity in action and of freedom from the human world and its conventions. The fables and anecdotes in the text attempt to illustrate the falseness of human distinctions between good and bad, large and small, life and death, and human and nature. While other ancient Chinese philosophers focused on moral and personal duty, Zhuangzi promoted carefree wandering and becoming one with "the Way" (Dào 道) by following nature. (Full article...)
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Roman copy (in marble) of a Greek bronze bust of Aristotle by Lysippos (c. 330 BC), with modern alabaster mantle

Aristotle (/ˈærɪstɒtəl/; Greek: Ἀριστοτέλης Aristotélēs, pronounced [aristotélɛːs]; 384–322 BC) was an Ancient Greek philosopher and polymath. His writings cover a broad range of subjects spanning the natural sciences, philosophy, linguistics, economics, politics, psychology and the arts. As the founder of the Peripatetic school of philosophy in the Lyceum in Athens, he began the wider Aristotelian tradition that followed, which set the groundwork for the development of modern science.

Little is known about Aristotle's life. He was born in the city of Stagira in northern Greece during the Classical period. His father, Nicomachus, died when Aristotle was a child, and he was brought up by a guardian. At 17 or 18 he joined Plato's Academy in Athens and remained there till the age of 37 (c. 347 BC). Shortly after Plato died, Aristotle left Athens and, at the request of Philip II of Macedon, tutored his son Alexander the Great beginning in 343 BC. He established a library in the Lyceum which helped him to produce many of his hundreds of books on papyrus scrolls. (Full article...)
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Werner Erhard: The Transformation of a Man, The Founding of est is a biography of Werner Erhard by philosophy professor William Warren Bartley, III. The book was published in 1978 by Clarkson Potter. Bartley was professor of philosophy at California State University and had studied with philosopher Karl Popper. He was the author of several books on philosophy, including a biography about Ludwig Wittgenstein. Erhard wrote a foreword to the book. The book's structure describes Erhard's education, transformation, reconnection with his family, and the theories of the est training.

The book went through five editions in its first year. Reviewers generally commented that the book was favorable to Erhard, and a number of critics felt that it was unduly so, or lacked objectivity, citing Bartley's close relationship to Erhard. Responses to the writing were mixed; while some reviewers found it well written and entertaining, others felt the tone was too slick, promotional, or hagiographic. (Full article...)
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Asa Gray in the 1870s

Asa Gray (November 18, 1810 – January 30, 1888) is considered the most important American botanist of the 19th century. His Darwiniana was considered an important explanation of how religion and science were not necessarily mutually exclusive. Gray was adamant that a genetic connection must exist between all members of a species. He was also strongly opposed to the ideas of hybridization within one generation and special creation in the sense of its not allowing for evolution. He was a strong supporter of Darwin, although Gray's theistic evolution was guided by a Creator.

As a professor of botany at Harvard University for several decades, Gray regularly visited, and corresponded with, many of the leading natural scientists of the era, including Charles Darwin, who held great regard for him. Gray made several trips to Europe to collaborate with leading European scientists of the era, as well as trips to the southern and western United States. He also built an extensive network of specimen collectors. (Full article...)
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The castle in the first circle of hell, as illustrated by Stradanus

The first circle of hell is depicted in Dante Alighieri's 14th-century poem Inferno, the first part of the Divine Comedy. Inferno tells the story of Dante's journey through a vision of hell ordered into nine circles corresponding to classifications of sin. The first circle is Limbo, the space reserved for those souls who died before baptism and for those who hail from non-Christian cultures. They live eternally in a castle set on a verdant landscape, but forever removed from heaven.

Dante's depiction of Limbo is influenced by contemporary scholastic teachings on two kinds of Limbo—the Limbo of Infants for the unbaptised and the Limbo of the Patriarchs for the virtuous Jews of the Old Testament; the addition of Islamic, Greek, and Roman historical figures to the poem is an invention of Dante's, which has received criticism both in his own time and from a modern perspective. Dante also uses his depiction of Limbo to discuss the Harrowing of Hell, using the motif to explore the concept of predestination. (Full article...)
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The illusory truth effect (also known as the illusion of truth effect, validity effect, truth effect, or the reiteration effect) is the tendency to believe false information to be correct after repeated exposure. This phenomenon was first identified in a 1977 study at Villanova University and Temple University. When truth is assessed, people rely on whether the information is in line with their understanding or if it feels familiar. The first condition is logical, as people compare new information with what they already know to be true. Repetition makes statements easier to process relative to new, unrepeated statements, leading people to believe that the repeated conclusion is more truthful. The illusory truth effect has also been linked to hindsight bias, in which the recollection of confidence is skewed after the truth has been received.

In a 2015 study, researchers discovered that familiarity can overpower rationality and that repetitively hearing that a certain statement is wrong can paradoxically cause it to feel right. Researchers attributed the illusory truth effect's impact even on participants who knew the correct answer to begin with, but were persuaded to believe otherwise through the repetition of a falsehood, to "processing fluency". (Full article...)
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Title page of the first collection of The Federalist (1788). This particular volume was a gift from Alexander Hamilton's wife Elizabeth Schuyler Hamilton to her sister Angelica

The Federalist Papers is a collection of 85 articles and essays written by Alexander Hamilton, James Madison, and John Jay under the collective pseudonym "Publius" to promote the ratification of the Constitution of the United States. The collection was commonly known as The Federalist until the name The Federalist Papers emerged in the twentieth century.

The first seventy-seven of these essays were published serially in the Independent Journal, the New York Packet, and The Daily Advertiser between October 1787 and April 1788. A compilation of these 77 essays and eight others were published in two volumes as The Federalist: A Collection of Essays, Written in Favour of the New Constitution, as Agreed upon by the Federal Convention, September 17, 1787, by publishing firm J. & A. McLean in March and May 1788. The last eight papers (Nos. 78–85) were republished in the New York newspapers between June 14 and August 16, 1788. (Full article...)
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Wave functions of the electron in a hydrogen atom at different energy levels. Quantum mechanics cannot predict the exact location of a particle in space, only the probability of finding it at different locations. The brighter areas represent a higher probability of finding the electron.

Quantum mechanics is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles. It is the foundation of all quantum physics including quantum chemistry, quantum field theory, quantum technology, and quantum information science.

Classical physics, the collection of theories that existed before the advent of quantum mechanics, describes many aspects of nature at an ordinary (macroscopic) scale, but is not sufficient for describing them at small (atomic and subatomic) scales. Most theories in classical physics can be derived from quantum mechanics as an approximation valid at large (macroscopic) scale. (Full article...)
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Greek text of Origen's apologetic treatise Contra Celsum, which is considered to be the most important work of early Christian apologetics

Against Celsus (Greek: Κατὰ Κέλσου, Kata Kelsou; Latin: Contra Celsum), preserved entirely in Greek, is a major apologetics work by the Church Father Origen of Alexandria, written in around 248 AD, countering the writings of Celsus, a pagan philosopher and controversialist who had written a scathing attack on Christianity in his treatise The True Word (Λόγος Ἀληθής, Logos Alēthēs). Among a variety of other charges, Celsus had denounced many Christian doctrines as irrational and criticized Christians themselves as uneducated, deluded, unpatriotic, close-minded towards reason, and too accepting of sinners. He had accused Jesus of performing his miracles using black magic rather than actual divine powers and of plagiarizing his teachings from Plato. Celsus had warned that Christianity itself was drawing people away from traditional religion and claimed that its growth would lead to a collapse of traditional, conservative values.

Origen wrote Contra Celsum at the request of his patron, a wealthy Christian named Ambrose, who insisted that a Christian needed to write a response to Celsus. In the treatise itself, which was aimed at an audience of people who were interested in Christianity but had not yet made the decision to convert, Origen responds to Celsus's arguments point-by-point from the perspective of a Platonic philosopher. After having questioned Celsus's credibility, Origen goes on to respond to Celsus's criticism with regard to the role of faith in Christianity, the identity of Jesus Christ, the allegorical interpretation of the Bible, and the relation between Christianity and traditional Greek religion. (Full article...)
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The Kingdom of This World (Spanish: El reino de este mundo) is a novel by Cuban author Alejo Carpentier, published in 1949 in his native Spanish and first translated into English in 1957. A work of historical fiction, it tells the story of Haiti before, during, and after the Haitian Revolution led by Toussaint Louverture, as seen by its central character, Ti Noel, who serves as the novel's connecting thread. Carpentier's work has been influenced by his multi-cultural experience and his passion for the arts, as well as by authors such as Miguel de Cervantes. The novel stems from the author's desire to retrace the roots and history of the New World, and is embedded with what Carpentier calls "lo real maravilloso" or "the marvelous real"—a concept he introduced to the world of literature (not to be confused with magical realism).

Throughout the novel, varying perceptions of reality that arise due to cultural differences between its characters are emphasized and contrasted. Carpentier explores hybridization, nature, voodoo, ethnicity, history and destiny, confusion, violence, and sexuality in a style that blends history with fiction and uses repetition to emphasize the cyclical nature of events. The novel was largely well-received with much attention paid to Carpentier's inclusion of magic realism and The Kingdom of This World has been described as an important work in the development of this genre in Caribbean and Latin American literature. However, some technical aspects of his style have been ignored by the academic community, and the novel's narrative organization has been criticized. (Full article...)
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Anarchism is a political philosophy and movement that is skeptical of all justifications for authority and seeks to abolish the institutions it claims maintain unnecessary coercion and hierarchy, typically including nation states, and capitalism. Anarchism advocates for the replacement of the state with stateless societies and voluntary free associations. As a historically left-wing movement, this reading of anarchism is placed on the farthest left of the political spectrum, usually described as the libertarian wing of the socialist movement (libertarian socialism).

Humans have lived in societies without formal hierarchies long before the establishment of states, realms, or empires. With the rise of organised hierarchical bodies, scepticism toward authority also rose. Although traces of anarchist ideas are found all throughout history, modern anarchism emerged from the Enlightenment. During the latter half of the 19th and the first decades of the 20th century, the anarchist movement flourished in most parts of the world and had a significant role in workers' struggles for emancipation. Various anarchist schools of thought formed during this period. Anarchists have taken part in several revolutions, most notably in the Paris Commune, the Russian Civil War and the Spanish Civil War, whose end marked the end of the classical era of anarchism. In the last decades of the 20th and into the 21st century, the anarchist movement has been resurgent once more, growing in popularity and influence within anti-capitalist, anti-war and anti-globalisation movements. (Full article...)
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Sir William Blackstone (10 July 1723 – 14 February 1780) was an English jurist, justice and Tory politician most noted for his Commentaries on the Laws of England, which became the best-known description of the doctrines of the English common law. Born into a middle-class family in London, Blackstone was educated at Charterhouse School before matriculating at Pembroke College, Oxford, in 1738. After switching to and completing a Bachelor of Civil Law degree, he was made a fellow of All Souls College, Oxford, on 2 November 1743, admitted to Middle Temple, and called to the Bar there in 1746. Following a slow start to his career as a barrister, Blackstone became heavily involved in university administration, becoming accountant, treasurer and bursar on 28 November 1746 and Senior Bursar in 1750. Blackstone is considered responsible for completing the Codrington Library and Warton Building, and simplifying the complex accounting system used by the college. On 3 July 1753 he formally gave up his practice as a barrister and instead embarked on a series of lectures on English law, the first of their kind. These were massively successful, earning him a total of £453 (£75,000 in 2023 terms), and led to the publication of An Analysis of the Laws of England in 1756, which repeatedly sold out and was used to preface his later works.

On 20 October 1759 Blackstone was confirmed as the first Vinerian Professor of English Law, immediately embarking on another series of lectures and publishing a similarly successful second treatise, titled A Discourse on the Study of the Law. With his growing fame, he successfully returned to the bar and maintained a good practice, also securing election as Tory Member of Parliament for the rotten borough of Hindon on 30 March 1761. In November 1765 he published the first of four volumes of Commentaries on the Laws of England, considered his magnum opus; the completed work earned Blackstone £14,000 (£2,071,000 in 2023 terms). After repeated failures, he successfully gained appointment to the judiciary as a Justice of the Court of King's Bench on 16 February 1770, leaving to replace Edward Clive as a Justice of the Common Pleas on 25 June. He remained in this position until his death, on 14 February 1780. (Full article...)

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General images - load new batch

The following are images from various philosophy-related articles on Wikipedia.

Image 1Portrait of René Descartes, after Frans Hals, second half of 17th century (from Western philosophy)
Image 2Bronze statue of Giordano Bruno by Ettore Ferrari, Campo de' Fiori, Rome (from Western philosophy)
Image 3From left to right: Virchand Gandhi, Anagarika Dharmapala, Swami Vivekananda, G. Bonet Maury. Parliament of World Religions, 1893 (from Eastern philosophy)
Image 4St. Anselm of Canterbury is credited as the founder of scholasticism. (from Western philosophy)
Image 5Patricia Churchland, 2005 (from Western philosophy)
Image 6Adi Shankara (8th century CE) the main exponent of Advaita Vedānta (from Eastern philosophy)
Image 7Bust of Socrates, Roman copy after a Greek original from the 4th century BCE (from Western philosophy)
Image 8Ferdinand de Saussure (from Western philosophy)
Image 9Sigmund Freud by Max Halberstadt, c. 1921 (from Western philosophy)
Image 10Fukuzawa Yukichi (1862) a key civil rights activist and liberal thinker (from Eastern philosophy)
Image 11Edmund Husserl, in the 1910s (from Western philosophy)
Image 12Four Greek philosophers: Socrates, Antisthenes, Chrysippos, Epicurus; British Museum (from Ancient Greek philosophy)
Image 13Erasmus is Credited as the Prince of the Humanists (from Western philosophy)
Image 14Valluvar, the Tamil philosopher of the post-Sangam era (from Eastern philosophy)
Image 15Aristotle in The School of Athens, by Raphael (from Western philosophy)
Image 16Saint Augustine. (from Western philosophy)
Image 17Portrait of John Locke, by Sir Godfrey Kneller, 1697 (from Western philosophy)
Image 18Søren Kierkegaard, sketch by Niels Christian Kierkegaard, c. 1840 (from Western philosophy)
Image 19Martin Heidegger (from Western philosophy)
Image 20Map of Alexander the Great's empire and the route he and Pyrrho of Elis took to India (from Western philosophy)
Image 21William James in 1906 (from Western philosophy)
Image 22Georg Wilhelm Friedrich Hegel, steel engraving, after 1828 (from Western philosophy)
Image 23Ionia, source of early Greek philosophy, in western Asia Minor (from Western philosophy)
Image 24Pyrrho of Elis, marble head, Roman copy, Archaeological Museum of Corfu (from Western philosophy)
Image 25Confucius (from Eastern philosophy)
Image 26The Seven Sages of the Bamboo Grove, embroidery, 1860–1880 (from Eastern philosophy)
Image 27St. Thomas Aquinas, painting by Carlo Crivelli, 1476 (from Western philosophy)
Image 28Xiong Shili circa 1960 (from Eastern philosophy)
Image 29Portrait of Immanuel Kant, c. 1790 (from Western philosophy)
Image 30Hu Shih and DT Suzuki during his visit to China in 1934 (from Eastern philosophy)
Image 31The Buddhist Nalanda university and monastery was a major center of learning in India from the 5th century CE to c. 1200. (from Eastern philosophy)
Image 32Bertrand Russell (from Western philosophy)
Image 33Gottlob Frege, c. 1905 (from Western philosophy)
Image 34Portrait by Philippe de Champaigne, 17th century (from Medieval philosophy)
Image 35Portrait of David Hume, by Allan Ramsay, 1754 (from Western philosophy)
Image 36Avicenna (from Medieval philosophy)
Image 37Friedrich Nietzsche, photograph by Friedrich Hartmann, c. 1875 (from Western philosophy)
Image 38The philosopher Pyrrho of Elis, in an anecdote taken from Sextus Empiricus' Outlines of Pyrrhonism
(upper)PIRRHO • HELIENSIS •
PLISTARCHI • FILIVS
translation (from Latin): Pyrrho • Greek • Son of Plistarchus

(middle)OPORTERE • SAPIENTEM
HANC ILLIVS IMITARI
SECVRITATEMtranslation (from Latin): It is right wisdom then that all imitate this security (Pyrrho pointing at a peaceful pig munching his food)

(lower)Whoever wants to apply the real wisdom, shall not mind trepidation and misery
(from Ancient Greek philosophy)
Image 39Abbo of Fleury (from Medieval philosophy)

Selected pictures

Image 1Painting of Gottfried Wilhelm Leibniz by Christoph Bernhard Francke, Braunschweig, Herzog Anton Ulrich Museum, 1700.
Image 2The center third of Education (1890), a stained glass window by Louis Comfort Tiffany and Tiffany Studios, located in Linsly-Chittenden Hall at Yale University. It depicts Science (personified by Devotion, Labor, Truth, Research and Intuition) and Religion (personified by Purity, Faith, Hope, Reverence and Inspiration) in harmony, presided over by the central personification of "Light·Love·Life".
Image 3Jane Addams (1860–1935) was an American settlement activist, reformer, social worker, sociologist, public administrator and author. She was a notable figure in the history of social work and women's suffrage in the United States and an advocate for world peace.
Image 4Leo Tolstoy in 1897. Count Lev Nikolayevich Tolstoy was a Russian writer who is regarded as one of the greatest authors of all time.
Image 5Friedrich Schiller (1759–1805) was a German poet, philosopher, physician, historian and playwright.
Image 6Lady Dorothy Browne and Sir Thomas Browne is an oil on panel painting attributed to the English artist Joan Carlile, and probably completed between 1641 and 1650. The painting depicts English physician Thomas Browne and his wife Dorothy.
Image 7Oscar Wilde reclining with Poems, by Napoleon Sarony, in New York in 1882. Wilde often liked to appear idle, though in fact he worked hard; by the late 1880s he was a father, an editor, and a writer.
Image 8Niels Bohr (1885–1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.
Image 9Adam Smith (baptised 16 June 1723 – died 17 July 1790 [OS: 5 June 1723 – 17 July 1790]) was a Scottish moral philosopher and a pioneer of political economics. One of the key figures of the Scottish Enlightenment, Smith is the author of The Theory of Moral Sentiments and An Inquiry into the Nature and Causes of the Wealth of Nations. The latter, usually abbreviated as The Wealth of Nations, is considered his magnum opus and the first modern work of economics. Smith is widely cited as the father of modern economics.
Image 10Plato (left) and Aristotle (right), a detail of The School of Athens, a fresco by Raphael. Aristotle gestures to the earth, representing his belief in knowledge through empirical observation and experience, while holding a copy of his Nicomachean Ethics in his hand, whilst Plato gestures to the heavens, representing his belief in The Forms.
Image 11A statue of peripatetic philosopher and botanist Theophrastus at the Palermo Botanical Gardens.
Image 12Philosophy, an 1896 mural by Robert Lewis Reid in the North Corridor on the Second Floor of the Library of Congress Thomas Jefferson Building, Washington, D.C.. The caption underneath reads: "HOW CHARMING IS DIVINE PHILOSOPHY."
Image 13Umberto Eco (1932–2016) was an Italian novelist, literary critic, philosopher, semiotician, and university professor. He is widely known for his 1980 novel Il nome della rosa (The Name of the Rose), a historical mystery combining semiotics in fiction with biblical analysis, medieval studies, and literary theory.
Image 14The House Builders (Portraits of Sir W.E. & The Hon. Lady Welby-Gregory), an 1880 painting by Frank Dicksee
Image 15Carl von Linné, Alexander Roslin, 1775 (oil on canvas, Gripsholm Castle). Linnaeus was a Swedish botanist, zoologist, and physician who formalised binomial nomenclature, the modern system of naming organisms. He is known as the "father of modern taxonomy".
Image 16The statue of Immanuel Kant in front of the Immanuel Kant State University of Russia in Kaliningrad. The statue was made by notable sculptor Christian Daniel Rauch and unveiled in 1864. The statue was destroyed in 1945, but was remoulded in 1992 on the initiative of Marion Dönhoff.
Image 17Voltairine de Cleyre (1866–1912) was an American anarchist known for being a prolific writer and speaker who opposed state power, the capitalism she saw as interconnected with it, and marriage, and the domination of religion over sexuality and women's lives. She is often characterized as a major early feminist because of her views.

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Academic Branches of Philosophy

Philosophy ponders the most fundamental questions humankind has been able to ask. These are increasingly numerous and over time they have been arranged into the overlapping branches of the philosophy tree:

Aesthetics: What is art? What is beauty? Is there a standard of taste? Is art meaningful? If so, what does it mean? What is good art? Is art for the purpose of an end, or is "art for art's sake?" What connects us to art? How does art affect us? Is some art unethical? Can art corrupt or elevate societies?
Epistemology: What are the nature and limits of knowledge? What is more fundamental to human existence, knowing (epistemology) or being (ontology)? How do we come to know what we know? What are the limits and scope of knowledge? How can we know that there are other minds (if we can)? How can we know that there is an external world (if we can)? How can we prove our answers? What is a true statement?
Ethics: Is there a difference between ethically right and wrong actions (or values, or institutions)? If so, what is that difference? Which actions are right, and which wrong? Do divine commands make right acts right, or is their rightness based on something else? Are there standards of rightness that are absolute, or are all such standards relative to particular cultures? How should I live? What is happiness?
Logic: What makes a good argument? How can I think critically about complicated arguments? What makes for good thinking? When can I say that something just does not make sense? Where is the origin of logic?
Metaphysics: What sorts of things exist? What is the nature of those things? Do some things exist independently of our perception? What is the nature of space and time? What is the relationship of the mind to the body? What is it to be a person? What is it to be conscious? Do gods exist?
Political philosophy: Are political institutions and their exercise of power justified? What is justice? Is there a 'proper' role and scope of government? Is democracy the best form of governance? Is governance ethically justifiable? Should a state be allowed? Should a state be able to promote the norms and values of a certain moral or religious doctrine? Are states allowed to go to war? Do states have duties against inhabitants of other states?