The famous dialogue "On Justice", the plan for organizing the ideal community of law and education, the exposition of the philosopher's political and ethical principles.

Books I-V: Introduction to the dialogue, examination of the concept of justice according to the prevailing views of the time. The creation of the city-state. The character of the city-state as a community of law and education. Elements of its organization and nature. Parallelism between the city and the soul. The inner character of the city-state. Equality of the two genders. Common ownership of women and children.