I don't believe in pessimism. If something doesn't come up the way you want, forge ahead. If you think it's going to rain, it will.

And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.

最好的数学是永恒的。

我不敢说数学和疯狂之间有直接关系，但毫无疑问，伟大的数学家都具有狂热的特质。