Answer: It is mainly reflected in borrowing and copying books, poor food and clothing, simple life, and difficult trekking. Through its difficulties, it reflects its "diligence" and can be so diligent in such a harsh environment.

The main statements are:

① Every time you borrow books from a library, you should take notes by hand and count the days to pay back. ② The inkstone is hard and your fingers cannot bend and stretch. ③