优秀的数学家应该既严谨又富有想象力。

"Experience is simply the name we give our mistakes."

现代采石必须将地质学的智慧与工程的创新相结合。

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

The only person you should try to be better than is the person you were yesterday.

The knowledge that you have emerged wiser and stronger from setbacks means that you are, ever after, secure in your ability to survive. You will never truly know yourself, or the strength of your relationships, until both have been tested by adversity. Such knowledge is a true gift, for all that it is painfully won, and it has been worth more than any qualification I ever earned.