Collection of folk proverbs: learning is like sailing against the current. If you don't advance, you will retreat.
Han Yuefu's Long Songs: Young people don't work hard, but old people are sad.
Qu Yuan: It's a long way to go, and I will go up and down.
Ushinski
Learning is labor, which is full of thoughts.
Zhu: It is difficult for a teenager to learn, but he is an excellent official. Every inch of time is an inch of light.