1. If a young man does not work hard, the old man will be sad.

2. The most difficult question for you is not necessarily the last question.

3. If you learn without thinking, you will be in vain; if you think without learning, you will be in danger.

4. Knowledge is the crystallization of precious gems, and culture is the luster of gems.

5. Black-haired people don’t know how to study hard, and white-headed people regret that they were late in studying.

6. If a bird wants to fly high, it first spreads its wings; if a man wants to make progress, he first studies.

7. Learning is like sailing against the current. If you don’t advance, you will retreat.

8. Read thousands of volumes and write like a master.

9. Diligence is the branches and leaves of learning, which is certainly bitter. Wisdom is the flower of learning, which is certainly fragrant.

10. It is much more difficult to turn words into actions than to turn actions into words.

11. There is nothing that cannot be known. We can only say that there are things that have not yet been recognized.

12. Don’t seize every minute to study, but seize every minute to study.

13. What we know is limited, but what we don’t know is infinite.

14. Like reading is equivalent to changing the lonely and boring time in life into moments of great enjoyment.

15. It doesn’t matter whether someone teaches you about learning. The most important thing is whether you have awareness and perseverance.