1, this paper first leads to the central argument that "the profound attainments of learning come from diligence" through proverbs and Han Yu's words in the Tang Dynasty, and then demonstrates it with "diligence produces results" and "diligence produces wisdom", and draws the conclusion that "the key to a person's knowledge is the degree of diligence".

2. Han Yu is quoted to make a central argument.

3. "Diligence" includes "Diligence produces results" and "Diligence produces wisdom"