And "As a teenager, it's gone forever. When you are exhausted, it is too late to learn. " Ancient poems with similar meanings.

1, young people don't work hard, and the elderly are sad. From Han Yuefu Long Songs

2, don't wait, white young head, empty and sad. From Yue Fei's "Man Jiang Hong"

3, Sanchunhua is good, you must learn early. Bloom sometimes falls, but life grows old. "precious time" from anonymity

4, black hair does not know how to study hard early, Bai Shoufang regrets studying late. From Yan Zhenqing's Persuasion.

5, young people are eager to learn, and an inch of time is not light. I didn't feel the dream of spring grass in the pond, and it was autumn before walking on the steps. -from Zhu's "Accidental Success"