Its core idea is to regard the "principle" or the principle and truth in the universe as primary, eternal and universal, while the world of sensory contact is a replica or phantom of the "principle" world, which has no eternity and universality, so it is not only secondary, but also unreal.

1, Plato is the ancestor of western objective idealism philosophy. He regards "principle" or the principle and truth in the universe as primary and eternal, while the world of sensory contact is a copy or phantom of the "principle" world, without eternity and universality. He believes that love is the admiration of beauty from the beautiful body in the world, and people can achieve eternal beauty through this love.

2. Plato also developed the traditional Greek inspiration theory. He believes that the source of creation is inspiration, and poets must be possessed by gods and turned into fanaticism in order to create great works. Plato's dialogues have made great contributions to Greek literature. Its characteristic is to solve problems by asking questions, enlightening and inducing, so that readers can not only see the results of speculation, but also see the process of ideological development.

3. Although Plato's thought has the significance of opposing vulgar love, it is essentially the view of spiritual aristocrats and a part of his idealism system. The "platonic spiritual love" of later generations comes from his love theory.