This should be one of his important educational thoughts.
"There is no student who can't teach well" embodies the student view that all students can "teach well".
As the object of education, any student must first admit that he can be educated and can make himself grow and progress through education, rather than "a rotten wood cannot be carved." This is undoubtedly correct.
But "teaching well" is relative, not absolute. Different students are very different, so it is impossible for them to study in all aspects. In the short term, as long as each student makes progress on the original basis, it should be regarded as "teaching well". In the long run, if some students become excellent talents and most of them become qualified citizens, it should be regarded as "teaching well". Some people think that "teaching well" means that every student is admitted to a university or even a key brand, which is a one-sided understanding formed in the environment of "exam-oriented education" and makes an absolute mistake in thought.