Knowledge is not equal to wisdom: knowledge is about things and wisdom is about life; Knowledge is the externalization of thought, and wisdom is the reflection of life; Knowledge can only see that a stone is a stone and a grain of sand is a grain of sand, but wisdom can see the scenery in the stone and find the soul in a grain of sand.

In Plato's view, wisdom refers to the knowledge about "the stage of goodness" or absolute goodness, and absolute goodness is absolute value. The purpose of education is to make people tend to absolute goodness through "knowing themselves". Therefore, people should constantly love and pursue wisdom, which can take care of people's soul and realize the turning of the soul.