一个好的数学家是能看到定理之间类比的人；一个伟大的数学家是能看到类比之间的类比的人。

You will never reach your destination if you stop and throw stones at every dog that barks.

I always tell my kids, 'If you're going to do something, do it well. And if you're not going to do it well, don't do it at all.'

书籍是最安静、最恒久的朋友；它们是最易接近、最明智的顾问，也是最耐心的老师。