Four books are the general names of four works: Daxue, The Doctrine of the Mean, The Analects of Confucius and Mencius. It is said that they are called "Four Books" (also called "Four Books") because of the four representatives of early Confucianism, namely Zeng Shen, Zi Si, Confucius and Mencius. During the first year of Song Guangzong (1 190), Zhu, a famous Neo-Confucianism scholar, collected works such as The University, The Analects of Confucius, Mencius and The Doctrine of the Mean in Zhangzhou, Fujian, and published them as a set of classics. The Confucian scholar believes that "go to college first to determine its scale; Read the Analects of Confucius for the second time to determine its roots; Read Mencius for the second time to see its development; When I read The Doctrine of the Mean, I once said that "Four Books and Five Classics, the Order of Six Classics" (Zhuzi) Zhu Zhu's annotation of Four Books and Chapters is of epoch-making significance. The Han and Tang Dynasties were the Five Classics era, and the Song Dynasty was the Four Books era.