From ancient Greece to today
Timeline
Twenty-five centuries of arguments, in order. Dates marked c. are approximate.
- The ancient world
- 585 BCEThales predicts an eclipseTradition dates the beginning of Greek philosophy to Thales of Miletus, who sought a natural explanation of the world, proposing that everything is water.
- c. 500 BCEHeraclitus: everything flowsThe world is in constant change, held together by the tension of opposites. The ancestor of every puzzle about identity over time.
- c. 480 BCEParmenides denies changeA poem argues from pure logic that what is cannot come from what is not, so change and plurality are illusions.
- c. 450 BCEZeno of Elea's paradoxesAchilles, the arrow and the dichotomy are devised to defend Parmenides. See Zeno's paradoxes.
- c. 450 BCEThe Buddha teaches not-selfIn northern India, the Buddha teaches that there is no permanent self behind the stream of experience. See the no-self view.
- 399 BCEThe trial and death of SocratesConvicted of impiety and corrupting the young, Socrates drinks hemlock rather than give up philosophy or escape.
- c. 387 BCEPlato founds the AcademyPlato's school in Athens, home of the theory of forms and later of Aristotle, lasts for centuries.
- c. 375 BCEThe RepublicPlato's dialogue on justice gives us the ring of Gyges and the allegory of the cave.
- 335 BCEAristotle opens the LyceumLogic, biology, ethics, physics and politics are organised into disciplines. The Nicomachean Ethics founds virtue ethics.
- c. 320 BCEZhuangzi dreams he is a butterflyA Daoist sage wakes unsure whether he is a man who dreamed of being a butterfly or a butterfly dreaming of being a man.
- c. 320 BCEPyrrho of Elis and the first scepticsSuspend judgement, Pyrrho teaches, and peace of mind will follow. See skepticism.
- c. 307 BCEEpicurus opens the GardenEpicurus teaches that pleasure, rightly understood, is the goal of life, and that death is nothing to us.
- c. 300 BCEZeno of Citium founds StoicismTeaching in a painted porch in Athens, he begins a school that will last five centuries. See Stoicism.
- c. 55 BCEOn the Nature of ThingsLucretius sets out Epicurean physics in Latin verse, including the symmetry argument about death.
- 65 CEDeath of SenecaOrdered by Nero to take his own life, the Stoic statesman leaves behind the Letters to Lucilius.
- c. 100 CEThe ship of Theseus, written downPlutarch records the Athenians' debate about whether a ship with every plank replaced is the same ship. See the Ship of Theseus.
- c. 108 CEThe Discourses of EpictetusA former slave's lectures, recorded by his student Arrian, set out the dichotomy of control.
- c. 175 CEMarcus Aurelius writes the MeditationsA Roman emperor's private notebook, written partly on campaign, becomes a classic of Stoic practice.
- c. 200 CESextus Empiricus records the scepticsThe Outlines of Pyrrhonism preserves ancient sceptical arguments, including the trilemma behind foundationalism.
- Late antiquity and the Middle Ages
- c. 400 CEAugustine on timeIn the Confessions, Augustine of Hippo admits he knows what time is until someone asks him. See the nature of time.
- c. 1020Ibn Sina's floating manIbn Sina (Avicenna) argues that a person suspended in the air, aware of no body, would still be aware of their own existence. See the mind-body problem.
- 1095The Incoherence of the PhilosophersAl-Ghazali argues that we never observe causes producing their effects, only one event following another.
- c. 1180The Incoherence of the IncoherenceIbn Rushd (Averroes) replies to al-Ghazali and defends natural causation and the philosophers' method.
- c. 1270Aquinas' Summa TheologiaeThomas Aquinas joins Aristotle with Christian theology, and in discussing self-defence states the idea behind the doctrine of double effect.
- c. 1340Buridan on the willJean Buridan holds that the will can suspend choice between equal options. His critics invent a starving donkey. See Buridan's donkey.
- The early modern period
- 1641Descartes' MeditationsRené Descartes doubts everything, imagines an Descartes' evil demon, and finds the cogito. Modern philosophy begins.
- 1651Hobbes' LeviathanThomas Hobbes imagines life without government as 'solitary, poor, nasty, brutish, and short', and argues for a social contract.
- 1654Pascal and Fermat found probabilityLetters about a gambling problem lay the foundations of expected value, which Blaise Pascal later applies to belief in God.
- 1670Pascal's Pensées publishedNotes found after Pascal's death include the wager, the ancestor of Pascal's mugging.
- 1677Spinoza's EthicsPublished after Baruch Spinoza's death: God or Nature, one substance, and a world in which everything happens by necessity.
- 1689Locke's EssayJohn Locke argues that the mind begins blank. A later edition (1694) adds the first modern theory of personal identity.
- 1710Berkeley: to be is to be perceivedGeorge Berkeley argues that there is no matter, only minds and their ideas.
- 1714Leibniz's MonadologyGottfried Wilhelm Leibniz's mill argument and principle of sufficient reason set up the questions behind why there is something rather than nothing.
- 1738Bernoulli and the St Petersburg gameDaniel Bernoulli proposes diminishing marginal utility as the answer to a game with infinite expected value. See the St. Petersburg paradox.
- 1739Hume's TreatiseDavid Hume questions causation, induction and the self. It 'fell dead-born from the press', he said. See the problem of induction.
- 1781Kant's Critique of Pure ReasonImmanuel Kant argues that the mind shapes experience, and that we can know things only as they appear to us.
- 1785Kant's GroundworkThe categorical imperative makes respect for persons the core of morality. See Kantian ethics.
- 1789Bentham's principle of utilityJeremy Bentham proposes that laws be judged by the happiness they produce, and asks of animals: can they suffer?
- The nineteenth century
- 1814Laplace's demonPierre-Simon Laplace imagines an intellect that could know the whole future from the present. See Laplace's demon.
- 1818Schopenhauer's World as WillArthur Schopenhauer describes reality as a blind, striving will, and life as swinging between pain and boredom.
- 1843Kierkegaard's Either/OrSøren Kierkegaard contrasts the aesthetic and ethical lives, beginning the tradition that becomes existentialism.
- 1863Mill's UtilitarianismJohn Stuart Mill defends the greatest happiness principle and distinguishes higher from lower pleasures.
- 1882God is dead; eternal recurrenceFriedrich Nietzsche's The Gay Science announces the death of God and introduces the eternal recurrence.
- 1890James' Principles of PsychologyWilliam James describes the stream of consciousness and helps found both psychology and pragmatism.
- The twentieth century
- 1901Russell's paradoxBertrand Russell finds a contradiction in the foundations of set theory and writes to Frege, who sees his life's work undermined. See Russell's paradox.
- 1905Special relativityEinstein shows that simultaneity depends on the observer, giving new life to the block universe picture of the nature of time.
- 1912The Problems of PhilosophyRussell's short introduction includes the chicken whose neck is wrung despite a lifetime of being fed.
- 1921Wittgenstein's TractatusLudwig Wittgenstein maps the limits of language. The Vienna Circle takes it up and launches logical positivism.
- 1934Popper's falsifiabilityKarl Popper argues that scientific theories can never be proved, only tested and refuted. See science and truth.
- 1935Schrödinger's catA thought experiment about a cat in a box dramatises the measurement problem in quantum mechanics.
- 1942The Myth of SisyphusAlbert Camus asks whether life is worth living in an indifferent universe, and answers yes. See the myth of Sisyphus.
- 1943Being and NothingnessJean-Paul Sartre argues that we are 'condemned to be free'. Two years later he declares that existence precedes essence.
- 1949The Second SexSimone de Beauvoir applies existentialism to the situation of women, founding modern feminist philosophy.
- 1950The Turing testAlan Turing asks whether machines can think and proposes the imitation game. See machine consciousness.
- 1950Fermi asks 'Where is everybody?'Over lunch at Los Alamos, Enrico Fermi wonders why there is no sign of alien life. See the Fermi paradox.
- 1957Many worldsHugh Everett proposes that quantum measurement splits reality into branches. See the many-worlds interpretation.
- 1962Structure of Scientific RevolutionsThomas Kuhn argues that science advances through revolutions, and coins the paradigm shift.
- 1963Gettier's three pagesEdmund Gettier shows that justified true belief is not enough for knowledge. See the Gettier problem.
- 1967The trolley problemPhilippa Foot introduces a runaway tram in a paper on abortion and double effect. Judith Jarvis Thomson later adds the footbridge. See the trolley problem.
- 1969Frankfurt cases and Newcomb's problemHarry Frankfurt challenges the principle of principle of alternative possibilities, and Robert Nozick publishes Newcomb's problem.
- 1971A Theory of JusticeJohn Rawls asks what principles we would choose behind a the veil of ignorance.
- 1972The drowning childPeter Singer argues that failing to help distant strangers is like walking past a child drowning in a pond. See the drowning child.
- 1974What is it like to be a bat?Thomas Nagel argues that science cannot capture the subjective character of experience. The same year, Nozick describes the experience machine.
- 1980The Chinese roomJohn Searle argues that running a program is not enough for understanding. See the Chinese room.
- 1982Mary's roomFrank Jackson imagines a colour scientist who has never seen red. See Mary's room.
- 1983Libet times the willBenjamin Libet reports brain activity that precedes the felt decision to move. See Libet's experiments.
- 1984Reasons and PersonsDerek Parfit argues that personal identity is not what matters. See the teleporter.
- 1995The hard problemDavid Chalmers separates the easy problems of consciousness from the hard problem.
- The twenty-first century
- 2003The simulation argumentNick Bostrom argues that at least one of three claims must be true, one of which is that we live in a simulation. See the simulation argument.
- 2008Decisions predicted seconds aheadBrain scans predict a simple choice, at about 60% accuracy, up to several seconds before people report deciding.
- 2023A 25-year bet settledNeuroscientist Christof Koch concedes a 1998 bet with Chalmers that the neural basis of consciousness would be clearly identified by 2023.