Black-haired people don’t know how to study hard, but white-haired people regret that they study too late - Yan Zhenqing
If young people don’t work hard, old people will be sad - "Han Yuefu. Long Song Xing"
Don’t wait for a while, the young man’s head has turned gray, and he is filled with sorrow - Yue Fei
You will regret the lack of books when you have used them, and you will not know the difficulty until you have experienced it - Lu You
There is nothing you can do without learning Great talent, but no learning without ambition - Zhuge Liang
If you don't peck at the jade, it will become useless.
If a person does not learn, he will not know - "Book of Rites"