It is one of the important viewpoints of Zhu's Neo-Confucianism to "preserve justice and destroy human desires", but this famous saying was not created by Zhu. For a long time, it has been circulated as Zhu's invention to "preserve justice and destroy human desires". In fact, this concept has already appeared in the Book of Rites, which says: "Those who make things will destroy the laws of heaven and the desires of the poor. Therefore, there is a rebellious and treacherous heart, and there is fornication. " The so-called "those who destroy justice and want poverty" here refers to those who do whatever they want without justice. Cheng said: "People are in danger because of their selfish desires. The heart is natural, so it is subtle. If you want to destroy selfish desires, you will be clear. " The so-called "eliminating selfish desires and managing tomorrow" here means "preserving justice and eliminating human desires". Later, Zhu said: "Confucius said' self-denial and self-respect', the doctrine of the mean said' to be neutral',' to respect morality',' to ask about learning by Tao', the university said' to be wise', and the book said' people are afraid of danger, the Tao is subtle, and the essence is unique, let it go'. Sages have a thousand words. What Zhu said was mainly aimed at the ruler (the son of heaven) at that time, getting rid of the worldly desire of arrogance and extravagance and governing the country according to heaven. The so-called "the son of heaven is kind, making virtue superior to heaven" is also true. Zhu said: "A thousand words from saints only teach people to preserve the natural principles and extinguish human desires", while "a scholar can only learn by doing whatever he wants and restoring the natural principles" (Volume 4 of Zhuzi Languages).