What is justice? Socrates constructs an ideal city to answer the question, then maps the city's structure onto the individual soul. Ten books covering education, censorship, the philosopher-king, the allegory of the cave, and the myth of Er. The most influential work of political philosophy ever written.
Start ReadingSocrates walks down to the Piraeus and gets drawn into a conversation about justice. Cephalus and Polemarchus offer conventional definitions — justice is telling the truth, giving people what they are owed. Thrasymachus erupts: justice is the interest of the stronger.
Glaucon and Adeimantus challenge Socrates to prove that justice is good in itself, not just for its consequences. Socrates proposes building a city in speech to find justice writ large — the foundation of the entire Republic.
The education of the guardians. Socrates censors Homer, bans tragic poetry, and designs a musical curriculum to produce courageous, moderate souls. The arts are too powerful to be left uncontrolled.
The three classes of the city — rulers, auxiliaries, producers — mirror the three parts of the soul: reason, spirit, appetite. Justice is each part doing its own work. The allegory is complete.
The three waves: women train alongside men, children are raised communally, and philosophers must rule. The philosopher-king is the most radical and most famous proposal in the history of political thought.
The divided line and the allegory of the cave. Socrates maps the ascent from shadows to sunlight — from opinion to knowledge, from the visible world to the Forms. The philosopher sees the Good and is blinded by it.
The philosopher returns to the cave. Socrates describes the education that turns the soul — arithmetic, geometry, astronomy, harmonics, and dialectic. The curriculum of the ideal state.
The decline of constitutions: aristocracy degenerates into timocracy, then oligarchy, then democracy, then tyranny. Each political form produces a corresponding type of soul.
The tyrannical soul. The tyrant is enslaved by his own desires — the most wretched of men, though he appears the most powerful. Justice, Socrates concludes, is always more profitable than injustice.
The banishment of the poets and the myth of Er. Socrates expels imitative poetry from the city, then tells the story of a soldier who dies and returns with a vision of the afterlife — souls choosing their next lives.