The most important tool in survival is not a knife or a fire starter. It’s your will to live.

The more you know who you are, and what you want, the less you let things upset you.

把（春秋末期晋国豪富）韩魏两大家庭的财产附加给某个人，他仍然谦虚谨慎，那么他的品质就比一般人强太多了。

数学中最深刻的洞见往往来自意想不到的类比。