The word "doctrine of the mean" comes from the Analects of Confucius, which records the words and deeds of Confucius and his disciples. Confucius said: "The Doctrine of the Mean is a virtue, and it has lasted for a long time." This means that Doctrine as a virtue is the highest state, but ordinary people have been lacking this virtue for a long time. "Zhongyong" appears once in "The Analects of Confucius". Its clear meaning cannot be seen from this sentence alone. However, later generations gave a clearer explanation of its meaning based on Confucius's related words and deeds recorded in The Analects. Zhu Xi, a scholar of the Song Dynasty, believed: "Medium means nothing but nothing less than mediocre. Yong means ordinary. In other words: "Middle" means not to go too far or not to fall short, while "yong" refers to mediocrity. The usual state. "The Golden Mean" requires people to choose or grasp a middle way between the two extremes of things, and can practice it anytime and anywhere in people's daily lives. Confucius did practice the Golden Mean throughout his life. Confucius also often viewed people and things with this attitude and method. For example, when he commented on his disciples, he thought that Zi Zhang was a bit biased in doing things, which he called "excessive", while Zi Xia always had a little confidence in doing things. Insufficient and rigid, he calls it "less than". In his opinion, "excess is still less than", that is, "excessive" and "underachieving" cannot maintain the middle way, and the effect of the two is obviously the same. What he advocated was "no fault, no inferiority". When Confucius evaluated the "Guan Sui" chapter in the "Book of Songs", he said that it was "happy but not obscene, sad but not sad", that is to say, the emotions it expressed Just right, happy but not too dissolute, sad but not too sad. Confucius often said "desire but not greed, peace but not arrogance, power but not force", "gentle but firm" and other words, which are to warn people: they can satisfy the individual. Desire, but not greed; people should be dignified, but not proud; people should be dignified, but not fierce. These are all manifestations of the virtue of moderation in a gentleman's personality. I understand that moderation should be consistent with the contradiction of modern philosophy. Almost. Zhong means seeking truth in contradictions; Yong means applying truth to practice. There are contradictions in everything, and a thing itself has inherent contradictions, so the Golden mean is the way and applies to everything in practice. Seek the truth, persist in the truth in difficulties, and use the truth to guide practice, so that society can progress. In the fields of natural science and social science, this Tao should be universal and cannot be limited to dealing with people.