The greatest blessing of our democracy is freedom. But in the last analysis, our only freedom is the freedom to discipline ourselves.

Mathematics is the music of reason.

The past is a foreign country; they do things differently there.

The only way to save a rhinoceros is to save the environment in which it lives, because there's a mutual dependency between it and millions of other species of both animals and plants.

人们不禁会感到这些数学公式拥有独立的存在和自己的智慧，它们比我们更聪明，甚至比它们的发现者更聪明。

真正的文学没有边界；它超越了时间和空间。

"You can't go back and change the beginning, but you can start where you are and change the ending."

人们是否在使用清洁能源、交通运输是否在优化、互联网是否在变得更好等等，这些工作都很重要。即使是少数人也可以影响这个世界。