Cave metaphor holds that human beings live in dark caves and can only see the images in the caves, but can't see the real world. These images are reflected by external things into caves, so people can only know the world through these images. Plato believes that education is to bring people out of the cave and let them see the real world, so as to know the truth and wisdom.

In Plato's ideal country, education is very important. He believes that only through education can people get rid of ignorance and prejudice and become intelligent and moral people. Therefore, Plato advocated the establishment of a comprehensive education system including literature, art, science, philosophy and other fields in order to cultivate people's all-round quality and ability.

Plato also emphasized that the importance of education lies in cultivating people's moral quality.

He believes that only by cultivating people's moral quality can people become virtuous and wise. Therefore, Plato advocates cultivating people's moral concepts and values through education, so that they can become moral and responsible people.

In a word, Plato expounded his educational thought through cave metaphor, that is, education is a process of getting rid of ignorance and prejudice and knowing truth and wisdom. He believes that only through a comprehensive education system to cultivate people's moral quality can people become virtuous and intelligent.