朋友能提供的唯一帮助，就是通过举一面镜子让你看到自己高尚的形象，从而保持勇气。

You can't control how other people feel, but you can control how you react to them.

The truth is, I often like women. I like their unconventionality. I like their completeness. I like their anonymity.

数学的力量在于它的普遍性和超越文化界限的能力。