The Republic study guide

Socrates

Socrates leads the inquiry by testing accounts of justice through questions, examples, and comparisons with skilled work. His questioning eventually reaches artistic imitation and the soul's immortality.

Key books: 1, 4, 7, 9, 10

Glaucon

Glaucon presses for a defense of justice that does not rely on rewards or reputation. He later accepts the immortality argument and asks to hear about rewards after death.

Key books: 2, 7, 10

Adeimantus

Adeimantus joins Glaucon in demanding a stronger defense of justice. His later agreement that overpowering desire can lead to parental abuse shows the inquiry's concern with desire's damaging effects.

Key books: 2, 9

Thrasymachus

Thrasymachus argues that justice serves ruling powers and defends the advantages of complete injustice. His position remains a challenge when Socrates later rejects the claim that service necessarily harms the servant.

Key books: 1, 9

Polemarchus

Polemarchus hosts the visitors and initially defends helping friends and harming enemies, but accepts objections to this account. Glaucon later recalls his part in redirecting the discussion.

Key books: 1, 8

Homer

Homer supplies a description of Autolycus that Socrates uses to examine guarding and stealing. Although Socrates admires him, he later questions Homer's authority as an educator and source of practical knowledge.

Key books: 1, 10

Hesiod

Hesiod's account of Uranus and Cronus becomes an example of stories judged unsuitable for children. Socrates later questions whether someone who genuinely improves others could remain a wandering performer.

Key books: 2, 10

Justice and happiness

The demand to defend justice without rewards or reputation makes its value independent of public approval the central problem. Socrates's contrast between unchecked desire and rational self-rule suggests that justice matters because of its connection with happiness, not merely its rewards.

Where it shows: books 2, 9

Education and character

Restrictions on poetry, imitation, and harmonies show education working on courage, restraint, and devotion to the State, rather than knowledge alone. The cave image connects learning with political duty, suggesting that education also changes a person's responsibilities toward others.

Where it shows: books 3, 7

Unity and division

Communal childrearing works as a proposed answer to the problem of civic division, making unity a concern of shared life. The guardians' later failures in reproduction and education show how divisions can undermine the city that these arrangements seek to protect.

Where it shows: books 5, 8

Rule and service

Thrasymachus's account makes justice serve ruling powers, raising the question of whose interests political authority protects. The requirement that philosophers govern despite preferring contemplation suggests a different understanding of rule, one grounded in duty rather than the ruler's preferred activity.

Where it shows: books 1, 7

Socrates, Book 1. Socrates says this while testing accounts of justice in the opening debate. It shows that harming others cannot simply become just through a proposed definition.

Glaucon, Book 2. Glaucon says this while demanding a stronger defense of justice. His contrast between reputation and conduct shows why public approval cannot settle whether someone is just.

Socrates, Book 6. Socrates answers the charge that philosophers are useless by shifting blame to those who will not employ them. This suggests that neglected ability and absent ability are different problems.

Socrates, Book 7. Socrates says this during the discussion of education. The existing capacity for learning suggests that education works by directing a power already present in the soul.

Socrates, Book 10. Socrates says this while defending restrictions on poetry. It shows that his challenge concerns poetry's influence on the passions, not simply whether it provides enjoyment.