It is said that the plain calligraphy was written by Huang Shigong in the late Qin Dynasty, and is regarded by the people as a strange book and a book from heaven. Although it proposes that "Tao, virtue, benevolence, righteousness, and propriety are all integrated into one," "Sushu" takes Tao, virtue, benevolence, righteousness, and propriety as the basis for governing the country, and it also takes Tao, virtue, benevolence, righteousness, and propriety as the basis for governing the country, and understands the principles of the natural movement of all things in the universe, so as to understand the origin of things.
Legend has it that Huangshi Gong tested Zhang Liang three times and then awarded this book to Zhang Liang. Zhang Liang relied on this book to help Liu Bang establish his empire.
