What do you mean, a studious person tries his best, but a doer finds it hard?

People who are good at learning exhaust their principles. People who are good at practice seek to solve the most difficult problems.

This sentence puts forward a standard question of "learning" and "doing good", which is of great educational significance. The general idea is that people who are good at learning can thoroughly understand the truth of things; Only those who are good at practice can explore the problems in things clearly. The language is Xunzi Outline.