在年老之后，你会发现自己的双手能解决很多难题。一只手用来帮助自己，另一只用来帮助别人。

Theorems are the permanent literature of mathematics.

失败只是宇宙告诉你下次不要做什么的方式。

我们开采的岩石讲述着地球的故事；我们只是这份遗产的临时保管者。

A hundred times every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving...

过去总是紧张的，未来才是完美的。