The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

一个人重要的是他谈论什么、而不是他赞同或不赞同什么。

2012年：贝索斯致股东信《长远思考才能做到不可能的事情》

The greatest discoveries in mathematics are those that unify seemingly unrelated ideas.