The necessity for political power and philosophical thought to coincide in the same person. The nature of the philosopher. The Idea of the Good. The Myth of the Cave. Special references to education. The constitutions, their deviant forms. Similarly, the decline of the city-state. Tyranny as the heaviest disease of the city. Just and unjust life. Eudaimonia and kakodaimonia. The moral superiority of justice over injustice. The heavenly pattern. Critique of imitation and mimetic arts. Condemnation of mimetic art. The "exile of the poets". The rewards of the just man. Eschatological myth.