If you don't suffer from what others don't know, you don't know what others are suffering from. Sharp tools make good work. An upright man is open and poised while a petty man is anxious and worried. Quick-minded and eager to learn, he is never ashamed to consult his inferiors. The three armed forces can win the handsome, but ordinary people can't win the ambition. When you are cold, you will know that pine and cypress will wither. Learning without thinking is useless, thinking without learning is dangerous. Never be contented with your study. Never be impatient with your teaching. Laozi's famous words of wisdom are listed as follows:

Everyone in the world knows that beauty is beauty, and evil is evil. It is well known that good is good, but not good. Whether or not they are born together, the difficulty and difficulty complement each other, the length and the length are in phase, the competition is in harmony, and the sound and sound are in harmony. Tsuneya No Shang Xian, so that the people do not dispute; Expensive and rare goods, so that people do not steal; If you can't see what you want, you won't be chaotic. It is ruled by saints, which can empty their hearts, strengthen their bellies, weaken their aspirations and strengthen their bones. Often make people ignorant and have no desire. Make a wise man dare not do it. If you do nothing, you will die. Heaven and earth are heartless, taking everything as a straw dog; Saints are heartless and treat the people like pigs.