数学家是能在定理间找到类比的人；更好的数学家能在理论间看到类比；而最优秀的数学家能注意到类比之间的类比。

"Pressure is a privilege—it means you're in a position to achieve something great."

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.

There are some people who never have fallen in love,if they hadn't heard there was such a thing.