1. Chapter 33 of "Laozi": "He who knows others is wise, and he who knows himself is wise."

2. "Han Feizi": "King Zhuang of Chu wanted to attack Yue. Zhuangzi admonished: "What's the point of the king's attack?" He said: "The government is in chaos and the army is weak." Zhuangzi said: "The minister is as smart as his eyes. He can see a hundred steps away but cannot see his own eyelashes. The king's soldiers will be defeated by Qin." In the Jin Dynasty, the land was hundreds of miles away. The troops of Chu were weak, and the officials could not restrain them. The king was weak and the chaos was not under the control of the king of Yue, but he wanted to attack Yue. "Wang Naizhi. The difficulty of knowing is not to see others, but to see oneself."

3: He who knows himself does not blame others. Those who blame others are poor, and those who blame others have no ambitions. Isn't it wrong to blame others? ... Therefore, the gentleman behaves normally, while the villain behaves strangely.

Selected from "Xunzi? Honor and Disgrace"

4: There is a classic Chinese saying: "It is important for a person to know himself"

This is what I know, please refer to it, and if you have any questions, please ask!