我们是没说出的话的主人。我们是说出的话的努力。

学习数学的唯一方法就是做数学。

I constantly see people rise in life who are not the smartest, sometimes not even the most diligent, but they are learning machines. They go to bed every night a little wiser than they were when they got up and boy does that help, particularly when you have a long run ahead of you.

生命真正的意义是种树，而不指望坐在树荫下。