在一个不自由的世界里，唯一的应对方式是变得如此绝对自由，以至于你的存在本身就是一种反叛。

It really matters whether people are working on generating clean energy or improving transportation or making the Internet work better and all those things. And small groups of people can have a really huge impact.

Quality is never an accident; it is always the result of intelligent effort.

Leadership is about making tough decisions today that will shape a better tomorrow.

I will not be able to write anything else. I have nothing more to say.

The essence of mathematics lies in its freedom.