Plato's ethics and political philosophy focus on virtue, knowledge, and the pursuit of the Good. He argues that true happiness comes from living virtuously, with wisdom, courage, moderation, and justice as key virtues. Plato believes education is crucial for cultivating virtue and shaping good citizens. In his ideal state, philosopher-kings with true wisdom govern society divided into three classes. Plato draws parallels between the state and the human soul, arguing that justice is achieved when each part performs its proper function in harmony with others.