意志力不是美德，而是神经冲动的定向爆破。

学习数学的最好方法就是做数学。

最难的事情是做到简单。

学习在于改变介于刺激和反应之间的某些中介过程。

The universe is not only stranger than we imagine, it is stranger than we can imagine.

Now, I am not going to stand here and tell you that failure is fun. That period of my life was a dark one, and I had no idea that there was going to be what the press has since represented as a kind of fairy tale resolution. I had no idea then how far the tunnel extended, and for a long time, any light at the end of it was a hope rather than a reality.