In the Republic, Socrates discusses the meaning of justice and whether the just man is happier than the unjust man with various Athenians and foreigners. He considers the natures of existing regimes and then proposes a series of hypothetical cities in comparison, culminating in Kallipolis, a utopian city-state ruled by a class of philosopher-kings. They also discuss aging, love, the theory of forms, the immortality of the soul, and the role of...