1. Song Guo Maoqian's "Collection of Yuefu Poems·Long Song Xing": A young man who doesn't work hard will become a sad old man.

Interpretation: If you don’t work hard when you are young and strong, studying when you have gray hair will be in vain.

2. Song Dynasty Yue Fei's "Man Jiang Hong·Written on the Heart": Don't wait for a while, the boy's head turns gray, and there is no sadness.

Interpretation: Don’t waste your years, your youth’s black hair will turn gray, and you will only have regrets and sorrows alone.

3. "Miscellaneous Poems" by Tao Yuanming of Jin Dynasty: The prime years will never come again, and it will be difficult to wake up again in one day. Be encouraged in time, time waits for no one.

Interpretation: Once youth has passed, it is impossible to come back again, and you will never see the second sunrise in a day. You should encourage yourself when you are young and strong. Time passes by and does not wait for others.

4. "Poems to Encourage Learning" by Yan Zhenqing of the Tang Dynasty: The lights are on at three o'clock and the chickens are on at five o'clock, which is when men are studying. Black-haired people don't know how to study diligently early, and white-haired people regret studying late.

Interpretation: The best time for boys to study is from midnight every day until the rooster crows. As a boy, you should know how to study hard and study diligently. But if you only know how to play and don't know how to study hard, you will regret when you are old that you didn't know how to study hard when you were young.

5. Qing Dynasty? Zhou Xitao's "Zengguang Xianwen": "When the book is used, it will be less regretful."

Interpretation: Only when you really use the knowledge will you regret that you have too little knowledge.