You are never too old to set another goal or to dream a new dream.

Talkers are usually more articulate than doers, since talk is their specialty.

金钱和成功不会改变人，它们只会放大已有的东西。

我希望我的读者能感到他们并不孤单。

最好的投资是那些能够改变世界的人。

I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.

Never stop asking, “How can we do this better?”