"Don't do it with small evil, don't do it with small good". It means don't do it just because it's a minor bad thing, and don't stop doing it just because it's a minor good thing. -Liu Bei.

learning is like sailing against the current. If you don't advance, you will retreat.

be knowledgeable, interrogate, think carefully, distinguish clearly, and stick to it. -"Book of Rites"

Young people who don't work hard are sad.

It is difficult for a teenager to learn and grow old, and an inch of time cannot be wasted.

there is a way to learn from books and mountains, and there is no limit to learning from the sea.

if you don't cut the jade, you won't know the etiquette.