数学的美在于它的普遍性。

Problems frequently get easier if you turn them around in reverse. In other words, if you want to help India, the question you should ask is not “how can I help India,” it’s “what is doing the worst damage in India? What will automatically do the worst damage and how do I avoid it?”

I don't believe in guilt, I believe in living on impulse as long as you never intentionally hurt another person.

"每一部伟大的作品都是作者与读者之间的一种无声对话。"