Knowing knowledge from things is an important concept in China's ancient Confucianism, which originated from The Book of Rites? As the Eight Commandments of the University said-learning things, knowing and doing, sincerity, integrity, self-cultivation, keeping the family in order, governing the country and leveling the world-"If you want sincerity, let him know first; Knowledge exists in things. The content is known, and the knowledge is sincere. However, this passage is the only passage in Da Xue, but no explanation was given afterwards, and the words "Wu Ge" and "Zhi Zhi" were not quoted in ancient books in the pre-Qin period, which made the true meaning of "Wu Ge Zhi Zhi" a mystery of Confucianism. The fifth edition of Modern Chinese Dictionary published in 2005 interprets "knowing knowledge by studying things" as "reasoning about the principles and laws of things and summarizing them as rational knowledge".