Leadership is about making tough decisions and standing by them, even when they are unpopular.

数学家的工作永无止境；总有新的问题要问，新的谜题要解。

The best way to reduce costs is to not have them in the first place.

一个把平等置于自由之上的社会两者都得不到。一个把自由置于平等之上的社会在很大程度上可以两者兼得。