Confucius said in the sixteenth session of the original Analects of Confucius: "A gentleman has three precepts: when he is young, his blood gas is uncertain, so he should be careful; It is also strong and bloody, and it is fighting; I am also old, my blood gas is declining, and I have to quit. "

Confucius said: "A gentleman should take three things as a warning: when he is young, his blood is not yet mature, and he should give up his infatuation with women; When you are mature and full of blood, you must give up fighting with others; When you are old, your blood is weak, and you should abstain from greed. "