The eyes cannot see both ways and the ears cannot hear both ways and understand. ——Xunzi's "Encouragement to Learning"

Free translation: It means that the eyes can see everything clearly because they cannot stare at two things (or two things) at the same time (due to concentration); Listen to the opinions of both people at the same time, so you can distinguish right from wrong.

If you don’t do one thing, you won’t be expert, and if you don’t be expert, you won’t be able to do it. ——Su Shi's "Ying Zhi Li Shang Liang Shu"

Free translation: People must be single-minded when studying. If you don't concentrate on one thing, you won't be able to concentrate. If you can't concentrate, you won't achieve anything.

Being absent-minded, turning a blind eye but not seeing, hearing but not hearing, eating without knowing its taste. ——"Laozi" Chapter 14

Free translation: Although I am looking, it is as if I have not seen; although I am listening, it is as if I have not heard; although I am eating, it is not as if I have heard anything. Know what it feels like. Therefore, in order to cultivate your own character, you must first correct your mind.

I don’t hear what is happening outside the window, and I only read the books of sages. ——From "Zengguang Xianwen"

Free translation: Completely ignoring other things, only focusing on the book.

Education is valuable, not general knowledge. ——Cheng Yi

Free translation: In learning, the most valuable thing is concentration. It is not good to only seek broad knowledge.

A gentleman’s learning is all about one thing, one is clear, and the clear is meritorious. ——Cheng Yi

Free translation: For a gentleman to learn, the most important thing is to be single-minded. If you are single-minded, you will be able to understand things, and if you understand things, you will gain something.

Those who are attentive will not be shocked by thunder. ?——Song Linbu's "Records of Saving Hearts"?

Free translation: Those who study with concentration will not be disturbed by thunder.

Instead of spending a lot of time and energy digging many deep wells, it is better to spend the same time and energy digging one deep well. ——Romain Rolland

Sparing your time and studying hard is a good way to learn. ——Cai Shangsi

Only by concentrating on learning can you get twice the result with half the effort. ——Cai Yuanpei

If you want to be effective in learning, you must concentrate. Learning itself is a hard thing, and only by hard work will there be corresponding gains.

——Gu Chaohao