1. Confucius said on the river: "The deceased is like a man who does not give up day and night." (Confucius)

2. If a young man does not work hard, an old man will be sad. (Yuefu " Long Song Xing").

3. An inch of time is worth an inch of gold, but an inch of gold cannot buy an inch of time.

4. Don’t wait for a while, as your young head will turn gray and you will feel empty and sad. (Yue Fei's "Man Jiang Hong")

5. Black-haired people don't know how to study early, and white-haired people regret studying late.