Philosophy Timeline
From the pre-Socratics to twentieth-century existentialism, twelve stages thread together an intellectual line spanning two thousand five hundred years. Tap a figure’s badge to jump to its card.
Ⅰ · The Pre-Socratics: From Myth to Reason
In sixth-century-BC Ionia, Thales first tried to explain the world by causes in nature itself rather than the will of the gods, and "philosophy" was thereby born. His student Anaximander abstracted the first principle into the "boundless" beyond the grasp of the senses; Pythagoras discovered that numerical ratios govern the harmony of music; and Xenophanes was the first to question humanity’s widespread tendency to imagine the gods after its own image — these thinkers together accomplished the first leap of human thought from mythical narrative to rational argument.
Thales Proposes That "Water Is the First Principle of All Things"
Thales sought to explain the origin of all things in the universe by a single natural substance, retrospectively named by Aristotle "the founder of philosophy," marking the beginning of rationalized natural philosophy.
Anaximander Proposes the "Boundless"
Anaximander held that the first principle of all things must transcend all concrete sensory quality, and proposed the abstract "boundless" (apeiron) — the true beginning of the Western metaphysical tradition of "seeking an abstract reality beyond experience."
Pythagoras Discovers That "All Is Number"
Pythagoras discovered from the interval ratios of the blacksmith’s shop that mathematical law governs cosmic harmony, and founded a brotherhood combining mathematical research and religious belief, profoundly shaping Plato’s philosophical conception of the eternity of mathematical truth.
Xenophanes Criticizes Anthropomorphic Conceptions of the Gods
Xenophanes pointed out that different peoples always imagine the gods after their own likeness, arguing from this that the moral failings of the gods in Homer’s epics are but a projection of human limitation — one of the earliest critiques of religion in the history of Western thought.
Ⅱ · The Athenian Golden Age
Socrates pulled philosophy back from the distant question of cosmic origin to "how one ought to live," exposing seemingly certain beliefs through a chain of questions, and at last meeting a composed death. His student Plato founded the Academy and proposed the theory of Forms that reshaped Western metaphysics; Plato’s student Aristotle systematically founded logic, covering nearly every field of knowledge then known. The divergence and inheritance across three generations of teachers and students laid the most central problem-consciousness of Western philosophy for the two thousand years after.
The Socratic Method and "Knowing That One Knows Nothing"
Socrates used a chain of questions to expose the gaps behind the seemingly certain beliefs of Athenian politicians and poets, holding that his own wisdom lay precisely in clearly knowing his own ignorance, and turned the focus of philosophy toward ethical questions.
The Death of Socrates
Condemned to death for "corrupting the youth and impiety toward the gods of the city," Socrates could have escaped into exile but chose to obey the verdict and composedly drink the hemlock — a choice that became the most thoroughgoing practice of his philosophical stance.
Plato Founds the Academy and Proposes the Theory of Forms
Plato founded the "Academy" in Athens and proposed the theory of Forms: the concrete things the senses reach are only imperfect copies of eternal Forms — a conception that profoundly shaped the Western metaphysical tradition of the two thousand years after.
Aristotle Founds the Lyceum and Systematizes Logic
Aristotle parted from his teacher Plato on the fundamental question of "whether Forms exist independently of concrete things," founded the Lyceum, systematically founded formal logic, and wrote works covering nearly every field of knowledge then known.
Ⅲ · The Hellenistic and Roman Ethical Schools
After the empire of Alexander fell apart, the stable order of Greek city-state politics was no more, and the focus of philosophy shifted from "how to govern the city" to "how the individual may attain inner tranquility in a turbulent world." Epicurus taught the moderation of desire in his garden, Zeno founded the Stoic school at the painted colonnade, Diogenes mocked worldly values in near-performance-art fashion, and Pyrrho advocated suspending judgment on all things — these schools later passed into Rome, where Seneca, Epictetus, and Marcus Aurelius carried Stoic practical wisdom to its peak, one of them even a Roman emperor himself.
Epicurus’s Garden and "Death Is Nothing to Us"
Epicurus advocated the pursuit of a tranquility of mind free from pain and fear, and with a materialist view of death argued that "death is nothing to us," seeking fundamentally to dissolve people’s irrational fear of death.
Zeno Founds the Stoic School
Zeno, stranded in Athens after a shipwreck while trading, took up the road of philosophy on chancing to hear stories of Socrates, and lectured at the painted colonnade, advocating living in accord with natural reason and distinguishing what is in our control from what is not, to attain inner peace.
Pyrrho’s Skepticism and "Suspending Judgment"
Pyrrho traveled to India with Alexander’s expeditionary army, and thereafter advocated suspending judgment on the nature of all things, holding that only so can one escape the anxiety that comes of clinging to a belief in certainty.
Stoicism in Rome: From Slave to Emperor
Epictetus, born a slave, proposed the "dichotomy of control" as a Stoic practical methodology; Seneca explored death and time management in epistolary form; and the Roman emperor Marcus Aurelius wrote his private notes, the Meditations, in his army tent — Stoicism completing its spread from the streets of Athens to the peak of Roman power.
Ⅳ · The Hundred Schools of Thought
Almost contemporary with ancient Greek philosophy, China’s Spring and Autumn and Warring States period saw its own first great explosion of thought. Confucius set the focus of philosophy on "ren" and "li"; Mencius and Xunzi held a pointed debate over whether human nature is innately good or bad; Laozi and Zhuangzi built another cosmology of "the Dao follows nature"; Mozi challenged the Confucian love with distinctions through "universal love and non-aggression"; and Han Feizi turned all this into a Legalist theory serving monarchical centralization — another intellectual revolution running parallel to ancient Greek philosophy yet moving toward an utterly different problem-consciousness.
Confucius Travels Among the States, Proposing "Ren" and "Li"
Confucius traveled among the states for fourteen years preaching the political ideal of "restraining the self and returning to ritual," and though rebuffed again and again, had followers throughout the land in education; "do not do to others what you would not have done to yourself" became the most concentrated statement of Confucian ethics.
The Divergence of Mencius’s "Goodness of Nature" and Xunzi’s "Badness of Nature"
Mencius held that people are born with the "four beginnings," sprouts of good; Xunzi held that human nature is innately bad and that goodness is a product of later ritual and education — a divergence within Confucianism over the essence of human nature that thereafter shaped two different paths of East Asian political philosophy.
Laozi’s "The Dao Follows Nature," Zhuangzi’s "Free Wandering and the Equality of Things"
Laozi left the five thousand words of the Dao De Jing expounding "governing by non-action"; Zhuangzi developed the relativist epistemology of the "equality of things" through "Zhuang Zhou dreams of a butterfly," together building the Daoist cosmology of "the Dao follows nature," a complementary intellectual tension with Confucianism.
Mozi "Stops Chu from Attacking Song," Han Feizi Synthesizes Legalism
Mozi challenged the Confucian stance of "love with distinctions" through "universal love and non-aggression," going in person to Chu to stop a war of invasion by action; Xunzi’s disciple Han Feizi integrated the three strands of "law, technique, and power," providing a systematic theoretical basis for the Qin dynasty’s monarchical centralization.
Ⅴ · The Unfolding of Buddhist Philosophy
Siddhartha awakened beneath the Bodhi tree and proposed the "Four Noble Truths" and "dependent origination," fundamentally denying the existence of any eternal unchanging substance. Centuries later, Nagarjuna in the Root Verses carried this thought to a rigorous dialectical peak, proposing that "dependent origination is emptiness" — emptiness is not nothingness but a precise description of the very manner in which things exist. This Buddhist philosophical system thereafter passed into China along the Silk Road, profoundly shaping the whole metaphysical tradition of East Asia.
The Buddha Awakens Beneath the Bodhi Tree, Proposing the "Four Noble Truths"
Siddhartha, having attained no liberation through austerities, turned instead to awaken to the "Middle Way" beneath the Bodhi tree, proposing the "Four Noble Truths" as the core philosophical framework for understanding the root of suffering and the way of liberation, and "dependent origination," which denies any eternal substance.
Nagarjuna’s Root Verses: Dependent Origination Is Emptiness
Nagarjuna systematically developed the Buddha’s thought of dependent origination, proposing the theory of "emptiness" and the rigorous dialectical argument of the "eight negations of the middle way," honored as the "Second Buddha," profoundly shaping the whole East Asian Mahayana Buddhist philosophical tradition thereafter.
Ⅵ · The Middle Ages: The Reconciliation of Reason and Faith
After the fall of the Roman Empire, the spark of ancient Greek philosophy was preserved and developed mainly through the Islamic world. Arab philosophers such as Ibn Sina and Ibn Rushd systematically commented on Aristotle, seeking to reconcile reason and faith; the Jewish philosopher Maimonides reconciled reason with the law of the Torah in the same way; and the Christian philosophers Augustine and Boethius explored time, fate, and free will within a Neoplatonic framework, all at last synthesized by Aquinas, who systematically integrated Aristotelian philosophy into Catholic theology — the philosophers of the three great religious traditions all facing, in the Middle Ages, the common question of "whether reason can lead to faith."
Augustine Asks "What Is Time?"
After converting to Christianity, Augustine, deeply inspired by Neoplatonism, proposed in the Confessions that time is not an objective container independent of the mind but the mind’s measurement of the threefold conscious activity of past, present, and future — more than thirteen hundred years before Kant’s transcendental view of time.
Boethius Writes The Consolation of Philosophy in Prison
Boethius, imprisoned by political frame-up, wrote The Consolation of Philosophy in prison, imagining Lady Philosophy descending to discuss with him the fickleness of fortune and free will — a work that thereafter became one of the most widely transmitted philosophical texts of the entire Middle Ages.
The Islamic Golden Age: Ibn Sina and Ibn Rushd Comment on Aristotle
Ibn Sina proposed the distinction of "existence" and "essence" and the "floating man" thought experiment; Ibn Rushd, famed for his detailed commentaries on Aristotle, was called "The Commentator," and the two’s divergence of interpretive path profoundly shaped the later development of European scholasticism.
Maimonides Reconciles Reason and Law, al-Ghazali Criticizes Philosophical Rationalism
Maimonides in the Guide for the Perplexed systematically reconciled Aristotelian rational philosophy with the Jewish legal tradition; al-Ghazali in The Incoherence of the Philosophers systematically criticized the rationalist system of Ibn Sina and others, and in his later years turned to Sufi mysticism.
Aquinas’s Summa Theologica Synthesizes Scholasticism
Aquinas drew heavily on the commentaries on Aristotle by Ibn Rushd, Ibn Sina, and Maimonides, proposed the "Five Ways" of proving the existence of God, and systematically integrated rational argument into official Catholic theology.
Ⅶ · Song-Ming Neo-Confucianism
Almost contemporary with European scholasticism, Chinese Confucian thought too underwent a profound philosophical reconstruction. Zhu Xi integrated Northern Song Neo-Confucianism and built a vast system in which "li" exists prior to all things, advocating the gradual recognition of heavenly principle through the "investigation of things and extension of knowledge"; more than three hundred years later, Wang Yangming, in the extremity of banishment, suddenly awoke to "mind is principle," proposing the "unity of knowledge and action" and "extending innate knowledge," holding that heavenly principle is already fully complete within each person’s mind — this divergence of the "study of principle" and the "study of mind" redefined how East Asian Confucian intellectuals thereafter understood the fundamental question of "how to know moral truth."
Zhu Xi Synthesizes the Study of Principle and Annotates the Four Books
Zhu Xi integrated the Neo-Confucian thought of the Northern Song two Chengs, holding that "li" is a metaphysical law prior to all things, to be recognized gradually through the "investigation of things and extension of knowledge"; his Collected Commentaries on the Four Books thereafter became the official examination text of the Yuan, Ming, and Qing.
Wang Yangming’s "Enlightenment at Longchang," the Proposal of the Study of Mind
Wang Yangming, having gained nothing from investigating bamboo for seven days in his youth, suddenly awoke to "mind is principle" after banishment to Longchang in Guizhou, proposing the "unity of knowledge and action" and "extending innate knowledge," fundamentally challenging the official orthodoxy long held by Zhu Xi’s study of principle.
Ⅷ · The Beginning of Modern Philosophy: Reason vs. Experience
Descartes rebuilt the ground of certainty for the system of knowledge with "I think, therefore I am," opening modern philosophy. Thereafter the continental rationalists (Spinoza, Leibniz) held that knowledge springs from innate ideas and pure rational deduction, while the British empiricists (Hobbes, Locke, Hume) insisted that all knowledge must spring from sensory experience — this "rationalism vs. empiricism" dispute, running nearly two hundred years, formed the most central problem-framework of early modern Western epistemology, until Kant at last sought to reconcile and unify it.
Descartes’s "I Think, Therefore I Am"
Descartes, through the method of universal doubt, derived "I think, therefore I am" as the unshakable first cornerstone for rebuilding the whole system of knowledge, and also proposed mind–body dualism, acknowledged as the "father of modern philosophy."
Spinoza’s Pantheism of "God, or Nature"
Spinoza, expelled from the Jewish community for his heretical thought, lived by grinding lenses and devoted himself to writing, proposing in the Ethics a pantheism in which there exists only one substance in the universe, fundamentally denying Descartes’s dualist stance.
Hobbes and Locke: Two Directions of Social Contract Theory
Hobbes in Leviathan held that the state of nature is "a war of every man against every man," and that only absolute monarchical authority can bring peace; Locke laid the foundation of empiricism with the "blank slate," holding that government power should be strictly limited and derived from the consent of the governed.
Leibniz’s "Monadology," Pascal’s Wager of Faith
Leibniz proposed the cosmology of "this is the best of all possible worlds" and the monadology; Pascal, with probabilistic thinking, proposed "Pascal’s wager," arguing that believing in God is more "profitable" in the weighing of interest.
Hume Questions the Necessity of Causation
Hume pushed empiricism to a skeptical extreme, arguing that causation is but a habitual belief the mind forms on the basis of "constant conjunction" — this "problem of induction" thereafter directly prompting Kant to build his whole system of critical philosophy in response.
Ⅸ · The Enlightenment and German Classical Philosophy
Voltaire and Rousseau drove the Enlightenment spirit of reason in utterly different ways — the former criticizing religious fanaticism in a satirical style, the latter reshaping the ground of political legitimacy with the theory of the "general will." Kant, stirred by Hume’s skepticism, proposed the "Copernican revolution" reconciling the century-long dispute of rationalism and empiricism; Hegel, building on Kant, constructed the even grander dialectical system of "Absolute Spirit." At the same time, Bentham and Mill developed utilitarian ethics in Britain, providing a theoretical basis for "the greatest happiness of the greatest number," forming with Kant’s deontology the two most important opposed paradigms of normative ethics.
Voltaire Satirizes Optimism, Rousseau Reconstructs the Social Contract
Voltaire in Candide sharply satirized Leibniz’s optimistic metaphysics; Rousseau proposed that "man is born free, and everywhere he is in chains," holding that government power should derive from a social contract embodying the general will — yet the two standard-bearers of the Enlightenment broke openly over their differences of idea.
Kant’s "Copernican Revolution"
Kant, stirred by Hume’s skepticism about causation, proposed the fundamental epistemological reversal that objects must conform to the forms of human knowledge, and built a deontological ethics with the "categorical imperative," profoundly shaping the course of Western philosophy for the two centuries after.
Hegel’s Dialectic and Absolute Spirit
Hegel, building on Kant, constructed the grand philosophy of history in which "Absolute Spirit" realizes itself through dialectical movement, proposing the "master–slave dialectic," later critically "inverted" by Marx and applied to historical materialism.
Bentham and Mill: Utilitarian Ethics
Bentham proposed "the greatest happiness of the greatest number" as the sole standard of morality and law; Mill revised Bentham’s stance that "pleasure has no difference of quality," holding that intellectual pleasures are superior to sensory ones, and proposed the "harm principle" in On Liberty.
Ⅹ · The Revolt of the Nineteenth Century: Doubt, Alienation, and the Will to Power
After Hegel built a seemingly all-encompassing rational system of history, the nineteenth century saw a string of fierce revolts against "system philosophy." Schopenhauer opposed rational optimism with the pessimistic "will to live," Kierkegaard opposed the Hegelian abstract system with the individual’s real existential anxiety, Marx "inverted" the dialectic to the analysis of historical materialism, and Nietzsche utterly shook the ground of traditional Western morality with "God is dead" and the "will to power" — these four paths of revolt together planted the seeds of twentieth-century existentialism, Marxism, and postmodernism.
Schopenhauer: The World as the Representation of Will
Schopenhauer, inspired by Kant yet giving an utterly different answer, held that the thing-in-itself is the blind "will to live," so that life is in essence full of suffering, and in his later years was one of the earliest Western philosophers to systematically study Buddhist philosophy.
Kierkegaard: The Leap of Faith
Kierkegaard deliberately opposed Hegelian system philosophy, focusing on the individual’s real existential anxiety, and used the story of Abraham sacrificing Isaac to argue that true faith must depend on a "leap of faith" beyond reason.
Marx Inverts Hegel: Historical Materialism
Marx "turned over" Hegel’s dialectic from its idealist framework, proposing that the contradictory movement of the material mode of production determines the succession of social forms, and that "the philosophers have only interpreted the world; the point is to change it."
Nietzsche: "God Is Dead" and the Will to Power
Nietzsche proclaimed the collapse of the ground of traditional Western morality, proposed the "will to power" and the thought experiment of "eternal recurrence," and held that only a thoroughgoing revaluation of values can truly overcome nihilism.
Ⅺ · The Twentieth Century: Analytic Philosophy and Scientific Reason
In the early twentieth century, Russell and Whitehead sought to derive all mathematical truth from pure logic; Wittgenstein’s Tractatus marked off the logical boundary of language with the "picture theory," then utterly overturned his early stance and turned to the theory of "language games." Popper drew the "falsifiability" line between science and non-science — these philosophers together laid the Anglo-American "analytic philosophy" tradition, stressing logical clarity and language analysis, in sharp contrast to the speculative style of contemporary continental philosophy.
Russell’s Mathematical Logic and "Russell’s Paradox"
Russell and Whitehead’s Principia Mathematica sought to derive all mathematical truth from logical axioms, and Russell’s own "Russell’s paradox" revealed a fundamental contradiction in the set theory of the time, directly driving the reform of axiomatic set theory.
Wittgenstein: From the "Picture Theory" to "Language Games"
Wittgenstein in his early years proposed in the Tractatus that language is a logical depiction of the facts of the world, and in his later years in the Philosophical Investigations utterly overturned his early stance, proposing that the meaning of a word depends on its "manner of use" in concrete situations of life.
Popper’s "Falsifiability" and the Poker Incident
Popper proposed "falsifiability" as the standard of demarcation between science and non-science, placing Marxist historical determinism and Freudian psychoanalysis outside strict science, and had the famous "poker" clash with Wittgenstein at Cambridge.
Ⅻ · The Twentieth Century: Existence, Deconstruction, and Justice
Heidegger asked anew about the meaning of "Being"; Sartre and Beauvoir developed existentialism into a whole philosophy of freedom and responsibility; Camus answered the crisis of meaning with the "absurd" — the intellectual clashes and breaks among the three form the most important chapter of postwar French philosophy. Foucault and Derrida further questioned the power and discourse structures hidden behind the Western rational tradition; Arendt reunderstood the roots of totalitarian atrocity with the "banality of evil"; and Rawls, in the Anglo-American tradition, laid a new foundation for justice with the "veil of ignorance" — the philosophy of the latter half of the twentieth century always shadowed by historical reflection on the two world wars and totalitarianism.
Heidegger Asks Anew About "Being"
Heidegger in Being and Time raised anew the question of "Being" forgotten by the Western philosophical tradition, proposing the existential analysis of "being-toward-death," yet also publicly supported the Nazi regime in 1933, leaving an unavoidable historical stain.
Sartre and Beauvoir: Existence Precedes Essence
Sartre proposed that "existence precedes essence," holding that a human being is "condemned to freedom" and must bear responsibility for his choices; Beauvoir in The Second Sex proposed that "one is not born, but rather becomes, a woman," founding existentialist feminism.
Camus’s "Absurd" and the Happiness of Sisyphus
Camus proposed the concept of the "absurd" to describe the gap between humanity’s craving for meaning and the world’s indifferent silence, holding that one should soberly revolt rather than flee, and later broke openly with Sartre over the question of Soviet political violence.
Foucault’s Genealogy of Power, Derrida’s Deconstruction
Foucault examined the mechanisms of power hidden behind institutions such as the prison and the asylum, proposing the concept of "power/knowledge"; Derrida questioned the "logocentrism" of Western philosophy and founded the method of deconstruction.
Arendt’s "Banality of Evil," Rawls’s Theory of Justice
Arendt, after attending Eichmann’s trial, proposed the "banality of evil," revealing that the abandonment of independent thought is itself enough to bring about grave evil; Rawls laid a new foundation for the liberal theory of justice with the "veil of ignorance" thought experiment, seeking to overcome the ethical flaw of utilitarianism.