From affection to politeness. Where did it come from?

From Preface to the Book of Songs and Mao Shi. Mao's Preface to Changing Style Poetry said: "Therefore, changing style is related to emotion and ends with ceremony. It is human nature to express feelings; It's just etiquette, and the first king's ze is also. "

"The Analects of Confucius Bashu" said: "Confucius said' Guan Ju', you are happy but not lewd, and you are sad but not hurt." In a word, both sadness and joy are "sentimental"; No sex and no harm means "stop at etiquette".

The same poetic theory and the same result, some people mistakenly think that this sentence comes from the Analects of Confucius.