那些疯狂到认为自己能改变世界的人，往往真的改变了世界。

The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.

所谓爱国心，是指因你生为这个国家的国民，相信这个国家比其他一切的国家高贵优越。

In mathematics, the art of proposing a question must be held of higher value than solving it.

成功是最好的报复。