练习时多流汗，战场上少流血。

I'm the narrator, and this is my life.

我不是歌手，我是一个表演者。

优秀的数学家不是知道所有答案的人，而是能提出正确问题的人。

我不会接受否定的答案。

A book should feel like a friend to a child—comforting, exciting, and full of surprises.

I think it's important to have a sense of humor about yourself and not take yourself too seriously.