世界是一个舞台，但我们大多数人只是舞台工作人员。

"Humor is the great thing, the saving thing. The minute it crops up, all our irritations and resentments slip away and a sunny spirit takes their place."

"Tennis is a sport where you have to be strong mentally and physically, but the mental part is even more important."

Then by your side,no bed-room me deny.

你越深入数学，就越意识到还有多少未知。

I would not dare to say that there is a direct relation between mathematics and madness, but there is no doubt that great mathematicians suffer from maniacal characteristics.