Knowing others means to know their ability, integrity, will, and other qualities. It is a prerequisite for the rational construction of various interpersonal relationships. Especially in the political sphere, those who govern need to know people to give them appropriate duties. However, ancient Chinese also realized that people often lacked true knowledge of others due to their own and external factors. Besides, people’s words and actions could sometimes obscure their true situation. Therefore, understanding a person’s actual situation requires a high degree of wisdom.