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A path through philosophy

What is a just society?

What makes political power legitimate, and a society just?

From the ancient city to the modern state, philosophers have asked what justice requires and who should rule. Follow the argument from Plato's ideal republic to today's debates over rights, equality, and power.

  1. 1
    Plato428–348 BCEPlatonism (The Academy)

    Justice is harmony: each part of the soul and each class of the city doing its proper work, ruled by those who know the good.

  2. 2
    Aristotle384–322 BCEPeripatetic (The Lyceum)

    Humans are political animals; justice is giving each their due, and the best state cultivates virtue and a large middle class.

    Responding toPlato

  3. 3
    Mozi470–391 BCEMohism

    In China: impartial care for all, judged by benefit to the people — against partiality, luxury, and wasteful war.

  4. 4
    Han Feizi280–233 BCELegalism

    The Legalist answer: order comes not from virtue but from clear, strictly enforced law and the ruler's power.

    Responding tothe Confucians

  5. 5
    Augustine of Hippo354–430 CEPatristics

    Earthly justice is always imperfect; true justice belongs to the City of God, not the earthly city of self-love.

  6. 6
    Thomas Aquinas1225–1274 CEScholasticism

    Just law is rooted in natural law — reason's share in the eternal law — and an unjust law is no true law at all.

  7. 7
    Niccolò Machiavelli1469–1527 CERenaissance Philosophy

    Sets ethics aside to ask how power is really won and kept; a ruler must sometimes do what private morality forbids.

    Responding tothe idealists' imagined republics

  8. 8
    Thomas Hobbes1588–1679 CEEmpiricism

    Justice and the state arise by contract out of the war of all against all; only an absolute sovereign secures peace.

    Responding tothe state of nature

  9. 9
    John Locke1632–1704 CEEmpiricism

    Government exists by consent to protect natural rights — life, liberty, property — and may be overthrown if it betrays them.

    Responding toHobbes' absolutism

  10. 10
    Jean-Jacques Rousseau1712–1778 CEEnlightenment

    Legitimate authority is the people governing themselves by the general will; 'man is born free, yet everywhere in chains'.

    Responding toLocke

  11. 11
    Mary Wollstonecraft1759–1797 CEEnlightenment

    Justice must include women: deny them education and rights and you deny half of humanity its freedom.

    Responding tothe Enlightenment's blind spot

  12. 12
    John Stuart Mill1806–1873 CEUtilitarianism

    Liberty is at the heart of a just society: power over the individual is justified only to prevent harm to others.

  13. 13
    Karl Marx1818–1883 CEMarxism

    Political rights ring hollow while the economy exploits: real emancipation requires abolishing class domination.

    Responding toliberal rights

  14. 14
    John Rawls1921–2002 CEPolitical Philosophy

    Justice as fairness: choose the rules behind a 'veil of ignorance', securing equal liberty and helping the least advantaged.

    Responding toutilitarianism

  15. 15
    Frantz Fanon1925–1961 CEPostcolonial Philosophy

    For the colonized, justice means decolonization — reclaiming humanity and land from a violent order built on race.

    Responding toEuropean claims to universal justice

  16. 16
    Martha Nussbaum1947 CE – presentPolitical Philosophy

    Measure justice by real human capabilities — what each person is actually able to do and to be.

    Responding toRawls