To teach mathematics is to inspire the next generation of thinkers and problem solvers.

伟大的事物需要时间。

I’ve had my best years after fifty. Age is just a number—it’s your attitude that counts. 

The next breakthrough won't come from doing things better, but from doing better things.

If liberty means anything at all, it means the right to tell people what they do not want to hear.

The time is always right to do what is right.

Every man is his own greatest enemy， and as it were his own murderer.

真相很少是纯粹的，也从不简单。