The argument that "there should be a spirit of understanding things", the argument that "natural science needs a real spirit of understanding things through the analysis of traditional education and the exposition of experimental spirit", and the argument that "on the basis of the four examples we found above and the truth they told us". Demonstration of famous sayings: Confucius once said: "A gentleman does not attract people with words, nor does he abolish them with people." Zhu's theory of "learning things for practical use and taking honesty as the foundation" has made him famous for "removing human desires and preserving justice".