This sentence comes from the Analects of Confucius.
This sentence Confucius not only talked about teaching methods, but also talked about learning methods. It is mainly about educators to stimulate students' ability to think actively, so that the educated can open up lively minds and vivid wisdom and be able to think independently. This is a typical "heuristic" teaching idea. He opposed the "spoon-feeding" mechanical teaching practice and asked students to "draw inferences from others".
Extended data:
"If you don't get angry, you will be threatened. If you don't get angry, you will get angry." It is often used to explain that students should be strict, let them think positively first, and then inspire them in time.
"Anger" is a contradictory psychological state in which students are actively thinking about a certain problem and are eager to solve it but have not yet figured it out. At this time, teachers should guide students' thinking methods in time to help students open their minds. This is "enlightenment".
"Anger" is another contradictory psychological state that students have been thinking about a certain problem for a while, but they have not yet considered it mature, but they want to say it but are difficult to express it. At this time, teachers should help students clear their minds, understand the essential attributes of things, and then express them in more accurate language, which is "hair".
"Replace three corners with one corner": Take one corner as an example to tell the learner, but he can't infer the other three corners, so there is no need to teach him again, because he doesn't think hard.