[Extensively involved in the Yixue before the Song Dynasty, and mostly based on Yang Xiong's old theory, which had a positive impact on the later Yixue]
Chinese Classics: Mainly discusses the relationship between heaven and man, as well as the principles between heaven, earth, humans and gods. Bao Yunlong listed the theories of Confucianism in the book, and then argued with his own opinions in order to clarify his own views. This work was included in the "Sikuquanshu", which shows its important status in the academic world.
