The book "University" was written by Zeng Shen, a disciple of Confucius in the Spring and Autumn Period, which profoundly expounded the principles and methods of governing the country by self-cultivation. When a mortal is alive, he must deal with the environment by himself, and in this process, he will either change himself, the environment or both. Self-cultivation is to change yourself, and governing the country is to change the environment. So the book "University" is really a must-read for the world. It is no accident that the ancients listed it as the first of the four books.