2. The book of Changes: "A gentleman's way is either out or in place, or silent or in words." Wang Fu of the Han Dynasty wrote "On Real Tributes": "A man of one talent, the strength of each tribute, the source is silent, not strong." The health-preserving theory of Tang Niu, Monk and Confucianism: "Be an official if you can, or retire if you can't." Zhang Zizheng is blessed with virtue, written by Wang Fuzhi of Qing Dynasty: "The way of a gentleman begins with language, and the officials who choose friends have no party. The wise and divers help each other, and when they are in the middle of the road, they are deified."