The Republic shows a perfect and superior city-state to later generations through Socrates' dialogue with others. Plato divided the country into three classes: the ruling class who received strict philosophical education, the samurai class who defended the country and the civilian class. He despises personal happiness and infinitely emphasizes the whole city-state and his own "justice". In Plato's eyes, people of the third class are inferior and can be deceived. He gave the ruler supreme power, and even the ruler "can lie to the enemy or citizens for the sake of national interests." Politics is a lecture of Aristotle's political theory and a master of ancient Greek political thought. Its core content is about city-states. On the premise of "man is a natural political animal", it analyzes the formation and foundation of polis, discusses various theories and systems of polis, studies the classification and reform of various regimes, and puts forward its own thoughts on ideal polis, thus becoming a pioneering work in western political science research. It is regarded as a model of political research system, Great Teaching Theory, Random Talk on Education, Emir, How Godud Educates Her Children, General Pedagogy, University Ideal, Educational Theory, Democracy and Education, Basic Principles of Curriculum and Teaching, Pedagogy of the Oppressed, Introduction to Lifelong Education, and Education.