I am too intelligent, too demanding, and too resourceful for anyone to be able to take charge of me entirely. No one knows me or loves me completely. I have only myself.

The only way to learn mathematics is to do mathematics.

如果你想飞翔，就必须放弃那些拖累你的事物。

音乐没有语言障碍。

经济历史的研究不仅仅是关于过去；它是关于理解当前不平等的根源。