The greatest use of a life is to spend it for something that will outlast it.

I have a sense of exile in thought, as if I were an alien.

"The most important skill for the future is learning how to learn."

数学是理性的音乐。

我不太在乎别人怎么说我，我只做自己想做的事。

No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.