In Plato's Republic, Socrates and the interlocutors Polymarchus, Thrasymacus, Adeimantus, or Glaucon discuss the nature of justice.

... In Plato's Republic, Socrates and the interlocutors Polymarchus, Thrasymacus, Adeimantus, or Glaucon discuss the nature of justice. They investigate many ideas pertaining to what justice is, outline the various sections of society, and eventually come to define justice itself. The climax of the dialogue is reached in Book VI when the underlying cause of justice is revealed. This fundamental principle is not limited solely to justice, however, but is the cause of all of the virtues. Socrates utilizes an analogy of the sun, as it pertains to the sensible world, to illuminate the way in which the Good, the underlying principle in question, affects the intelligible world. He demonstrates how the ideal rulers come to know the Good by way of their education and that once this knowledge is possessed they can implement order that will bring about a just, virtuous and ultimately good city-state. The Good causes the forms

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