A good world needs knowledge， kindliness， and courage； it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.

God expects but one thing of you, and that is that you should come out of yourself in so far as you are a created being made and let God be God in you.

数学不是关于数字、方程、计算或算法的：它是关于理解的。

The best directors are the ones who can make the audience feel something.

如果你没有犯错，说明你不够努力。