Laozi's famous saying, give up when you are young and give up when you are old.

Confucius, the sixteenth son of the original Analects of Confucius, said: "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; It is also old and its blood gas is declining, so it is necessary to quit. "

Confucius said: "A gentleman should take warning from three things: when he was young, his blood was immature, so he should give up his infatuation with women;" When you are mature and full of blood, you should give up fighting with others; When you are old, your blood gas is already weak, so you should give up greed. "