Learning knowledge from things and learning from The Book of Rites University is an important learning method for Confucianism to gain true knowledge. But personally, the most important knowledge is embodied in its last sentence, which is not only "knowing things before knowing people, but also being sincere". "Know them" here is not "know them". In our natural practice, the knowledge we have acquired may be wrong, so we should "know them" only to acquire correct knowledge, not a little knowledge or mistakes.

If we don't "know the truth", the wrong theory we get in that way is not only beneficial to ourselves, but also harmful to ourselves.

For example, Zhu's thought of respecting nature and destroying human nature in Song Dynasty is a fallacy that ignores people's subjective initiative, which turns the original beautiful Confucianism into a scalpel to castrate China people's blood and humanity, leading to the stagnation of natural science in China and the backwardness of modern China.