One Concept, Many Minds
A single concept — Freedom, Justice, Happiness — seen through the positions of the thinkers who defined it.
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Freedom
One idea across the whole tradition — from inner mastery of the passions to political non-domination and the capacity to actually live the life one chooses.
Open →8 thinkersJustice
From giving each his due and the well-ordered soul to fairness behind a veil of ignorance and the entitlements of free exchange.
Open →8 thinkersHappiness
From eudaimonia as excellent activity and the calculus of pleasure to the tranquil mind, the meaningful life, and what science can measure.
Open →14 thinkersVirtue
From Confucian ritual and Socratic knowledge to Aristotle's mean, Christian charity, and the modern revival of character ethics — one idea about human excellence.
Open →13 thinkersThe Good
From Plato's Form of the Good and Plotinus' One to Bentham's pleasure, Moore's indefinable quality, and Murdoch's sovereign Good — the highest of concepts examined.
Open →13 thinkersEvil
From Manichaean dualism and Augustine's privation to Leibniz's best of all worlds, Dostoevsky's rebellion, and Arendt's banality — the problem that will not resolve.
Open →12 thinkersDuty
From the Gita's dharma and Cicero's offices to Kant's categorical imperative, Ross's prima facie duties, and Williams' revolt against the 'moral ought'.
Open →12 thinkersCourage
From Homer's warriors and Socrates' Laches to Aristotle's mean, Aquinas' fortitude, Kierkegaard's leap, and Tillich's courage to be.
Open →13 thinkersWisdom
From the fear of the Lord and the Tao to Socratic ignorance, practical wisdom, and the Stoic sage — one idea pulled between contemplation and action.
Open →14 thinkersLove
From Sappho's fire and Plato's ladder to Christian charity, Sufi longing, and the modern art of loving — Eros, philia, and agape in one view.
Open →12 thinkersFriendship
From Aristotle's three friendships and Cicero's ideal to Montaigne's 'because it was he,' Emerson's ethics of solitude, and Derrida's politics of the friend.
Open →12 thinkersDeath
From Socrates' cheerful trial and Epicurus' 'death is nothing' to Heidegger's being-toward-death and Camus' absurd — how mortality shapes living.
Open →12 thinkersSuffering
From Job's protest and the Buddha's first noble truth to Nietzsche's amor fati, Weil's affliction, and Frankl's search for meaning.
Open →12 thinkersHope
From the theological virtue of Paul and Aquinas to Bloch's revolutionary utopia and Camus's defiant refusal — hope defended, criticized, and reinvented.
Open →14 thinkersBeauty
From Plato's eternal Form to Kant's disinterested pleasure and Scruton's defence of the sacred — objective harmony, subjective taste, and the birth of aesthetics.
Open →13 thinkersTruth
From Aristotle's correspondence and Tarski's formal definition to James's pragmatism and Heidegger's unconcealment — the many theories of what 'true' means.
Open →13 thinkersKnowledge
From Plato's justified true belief to Gettier's counterexamples and Foucault's power/knowledge — the sources, limits, and definition of knowing.
Open →13 thinkersReason
From Heraclitus's logos and Kant's critique of pure reason to Weber's rationalization and Habermas's communicative reason — the powers and pathologies of reason.
Open →12 thinkersDoubt
From the ancient sceptics' suspension of judgment to Descartes' method and Peirce's fallibilism — doubt as poison, as tool, and as tranquillity.
Open →14 thinkersBeing
The oldest question of metaphysics, from Parmenides' changeless One to Heidegger's forgotten question of Being and Quine's terse 'to be is to be the value of a variable'.
Open →12 thinkersTime
From Augustine's 'if no one asks me, I know' to Newton's absolute time, Kant's form of intuition, and Einstein's relativity — the many faces of the most familiar mystery.
Open →13 thinkersCausality
From Aristotle's four causes and the occasionalists' God to Hume's constant conjunction, Kant's category and Lewis's counterfactuals — the hidden glue of the world.
Open →14 thinkersGod
From Aristotle's unmoved mover and Anselm's ontological proof to Spinoza's God-or-Nature, Pascal's wager, Hume's critique and Nietzsche's death of God.
Open →12 thinkersThe Soul
From the transmigrating soul of Pythagoras to Aristotle's form of the body, the immortal spirit of the theologians, and the modern suspicion that the 'ghost in the machine' is a mistake.
Open →12 thinkersThe Self
From Descartes' certain 'I think' to Locke's memory, Hume's bundle, the Buddhist denial of any self, and Parfit's claim that identity may not matter.
Open →13 thinkersFree Will
The oldest tension in philosophy: from Chrysippus' compatibilism and Augustine's grace to Kant's autonomy, Sartre's radical freedom, and van Inwagen's consequence argument.
Open →12 thinkersConsciousness
From Descartes' transparent mind and Leibniz's mill to Nagel's bat, Searle's Chinese Room, Dennett's deflation, and Chalmers' hard problem.
Open →12 thinkersNothingness
From Parmenides' ban on non-being and Laozi's fertile emptiness to Nāgārjuna's śūnyatā, Hegel's dialectic, Heidegger's dread, and the Kyoto School's absolute nothingness.
Open →12 thinkersPower
From the naked rule of the stronger to will to power, hegemony, and the capillary micro-powers that run through every relationship.
Open →12 thinkersAuthority
The puzzle of legitimate command — from divine and natural order to consent, charisma, and the anarchist claim that no such right can exist.
Open →13 thinkersEquality
From equality before the law to equality of resources, opportunity, and worth — and the recurring dispute over whether inequality is natural, just, or intolerable.
Open →12 thinkersRights
From natural and human rights to Bentham's 'nonsense upon stilts' — the disputed foundations of what individuals may demand of others.
Open →13 thinkersDemocracy
From Athenian self-government to competitive elections, deliberation and its critics — the promise and the peril of rule by the many.
Open →14 thinkersThe State
From the just polis and the City of God to the social contract, the modern monopoly on violence, and the anarchist and libertarian challenges to the state itself.
Open →12 thinkersProperty
From labour and first occupation to personality, theft, and the single tax — the shifting grounds of ownership and its limits.
Open →12 thinkersLaw
From natural law and the sovereign's command to the pure theory of norms, the rule of law, and law as integrity — the great debate over what law is.
Open →12 thinkersRevolution
From the right of resistance and the reforming caution of Burke to the class war of Marx and the founding of freedom in Arendt — the promise and terror of beginning anew.
Open →12 thinkersWar and Peace
From the art of victory and the just war tradition to perpetual peace, war as politics by other means, and nonviolent resistance.
Open →13 thinkersValue
From the Good beyond being to marginal utility and the transvaluation of all values — where worth comes from and whether it can be known.
Open →13 thinkersMoney
From Aristotle's medium of exchange to the quantity theory, the state theory, and Keynes's liquidity — the many faces of the most abstract institution.
Open →12 thinkersWork
From Hesiod's honest toil to alienated labour and the leisure basis of culture — how the tradition has judged the work of human hands.
Open →13 thinkersLanguage
From the naturalness of names to sense and reference, the linguistic turn, and language games — the medium philosophy could not see past.
Open →12 thinkersMemory
From recollection of the Forms to the forgetting curve and collective memory — how the mind holds, remakes, and is made by the past.
Open →14 thinkersArt
From Plato's suspicion of imitation to Danto's artworld — how thinkers have tried to say what makes something art and why it matters.
Open →12 thinkersThe Sublime
The feeling of the vast, the terrifying and the boundless — traced from Longinus's rhetoric to Burke's terror, Kant's reason and Lyotard's unpresentable.
Open →14 thinkersNature
One of philosophy's most contested words — from Laozi's way and Aristotle's physis to Bacon's mastery, Spinoza's God, Darwin's selection and deep ecology.
Open →13 thinkersProgress
The modern faith that things get better — championed by Bacon, Condorcet, Comte and Marx, and put on trial by Rousseau, Benjamin, Adorno and John Gray.
Open →13 thinkersThe Meaning of Life
The question behind all the others — answered by flourishing, faith, defiance, absurdity or self-made purpose, from Ecclesiastes to Camus, Frankl and Susan Wolf.
Open →13 thinkersFaith
From Paul's assurance of things hoped for to Kierkegaard's leap and James's will to believe — belief without certainty examined across the tradition.
Open →13 thinkersHuman Nature
Mencius says good, Xunzi says bad, Hobbes says wolfish, Rousseau says corrupted by society, Sartre says there is none — the deepest disagreement in ethics.
Open →14 thinkersDesire
From the Buddha's craving and Plato's eros to Spinoza's conatus, Schopenhauer's will and Lacan's lack — what wanting is and what it wants.
Open →12 thinkersFear
From Epicurus curing fear of death to Machiavelli wielding it, Kierkegaard's anxiety and Heidegger's Angst — the emotion that governs so much of life.
Open →12 thinkersAlienation
From Hegel's estranged spirit and Marx's four forms of alienated labour to Durkheim's anomie, Weber's iron cage and Debord's spectacle.
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