To know the root is to know the root clearly.
On knowing people and discussing the world, but still on knowing people and discussing the world. It refers to understanding a person and studying his times. It also refers to identifying people and commenting on the world.
Baozi knows that I mean mutual understanding and deep friendship.
Knowing yourself and knowing yourself refers to reasonable things. Look at yourself and you will know others.
Intimacy is the most important thing, and heart-to-heart is the most important thing, which means that friends are soul mates.
Keiko knows that Keiko refers to the benefit of Song people in the Warring States Period. He is a famous scholar among the pre-Qin philosophers and a friend of Zhuang Zhou. After Hui's death, Zhuang Zhou visited his tomb, and once borrowed the fable of the craftsman's stone chalk, feeling that "since the death of the master, there is nothing to think about and say." See Zhuangzi Xu No Ghost. Later, because "Keiko knows me" means that friends know each other very well.