War is an ugly thing， but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth a war， is much worse.

If you don’t make mistakes, you’re not working on hard enough problems. And that’s a big mistake.

The best way to predict the future is to create it.

数学的美在于它让我们看到世界上不立即显现的模式和结构。

语出西汉·桓宽《盐铁论·力耕》 。治理家庭不能靠一件财宝；治理国家，不能靠一种方法。

光明在书中。把书完全打开，让它发光，让它发挥作用。