Don't be angry, don't start work, don't worry, don't send it, give it a corner, and don't use three corners to object. (The Analects of Confucius)

Attention ① Anger: I tried to get through but failed. I want to say it, but I don't know how to say it. ③ Angle (yú) Relative: "Angle" refers to angle and angle. "Angular opposition" refers to analogy.

Translation (students) don't inspire him if he doesn't figure it out after repeated thinking; If you don't think and have some experience, don't enlighten him if you want to say it but can't say it. Take one corner as an example to tell the learner, but he can't infer what the other three corners are like, so there is no need to teach him again and again.

Comment on why "don't teach him again and again" because he doesn't think hard. The above discussion is an important famous saying of Confucius about heuristic teaching, which has a far-reaching influence on later generations, and the idiom "draw inferences from others" comes from it. Confucius realized that similar things could be inferred from each other and thought that everything could belong to a certain class. From the known nature of something in a certain category, we can infer that other things in this category also have this nature, thus putting forward this famous analogy teaching method.