你不可能爱所有人，但你可以对所有人友善。
You can't love everybody, but you can be kind to everybody.
对于只有一把锤子的人来说，每个问题看起来都像是钉子。
Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
The best way to find out if you can trust somebody is to trust them.
所以勇往直前吧。跌倒吧。你会从地上看到一个不同的世界。