The poor are not irrational; they are just as rational as anyone else, but they operate under very different constraints.

动物和人类的有目的行为。

成功不是被给予的，而是赢得的。

我了解到失败只是过程的一部分，你不能让它打败你。

The closer you are to death, the more alive you feel. It's a wonderful way to live. It's the only way to live.

做数学就是探索一个无限的思想景观。