人之有生,不为一已。
We are not born for ourselves.
The true artist is not the one who is inspired, but the one who inspires others.
Every problem in mathematics is an opportunity to learn something new.
有一个人从天堂来到人间旅游,他所使用的是有效三十天的减价票,他试图要把他的回程票卖掉。
Diplomacy is the art of restraining power.