Dialogues · Chapter
Introduction and Analysis explained
This chapter explores the nature of justice by comparing the individual soul to the state, identifying three parts of the soul (reason, spirit, desire) corresponding to three classes in the state.
What happens
This chapter explores the nature of justice by comparing the individual soul to the state, identifying three parts of the soul (reason, spirit, desire) corresponding to three classes in the state. Justice is defined as each part doing its own business, a harmony of the whole. The chapter also discusses Plato's views on education as turning the eye of the soul toward the light, emphasizing the unity of virtues and the supremacy of justice.
Themes in this chapter
Justice and Injustice
Justice is defined as each part of the soul or class in the state doing its own business, a harmony of the whole; injustice arises when parts interfere with each other's roles.
Education and Virtue
Education is portrayed as turning the eye of the soul toward the light, implanting a principle of intelligence, and curing vice through knowledge.
Knowledge and Ignorance
The chapter contrasts true knowledge (ideas) with opinion (sensible world), and emphasizes that virtue is knowledge and vice arises from ignorance.
Characters to notice
- Socrates
Leads the inquiry into justice, identifying it with the principle of each part doing its own business in both the state and the individual soul.
- Glaucon
Socrates' interlocutor, who is urged to follow the argument and is addressed directly in the search for justice.
- Aristotle
Referenced in comparison to Plato's conception of justice and virtue, particularly in the Nicomachean Ethics.
Key passages
“Have you forgotten our old principle of the division of labour, or of every man doing his own business, concerning which we spoke at the foundation of the State—what but this was justice?”
Socrates reminds Glaucon that the principle of each person doing their own job, which was established when founding the ideal state, is essentially justice.
This passage defines justice as the harmony of each part fulfilling its proper role.
“Education, as he says, will implant a principle of intelligence which is better than ten thousand eyes.”
Plato asserts that education instills a rational principle far more valuable than any amount of sensory perception.
Highlights Plato's view that true knowledge comes from within, not from external senses.