幸福！它那对死亡来说甜蜜的牙齿，在鸡鸣时警告我——在晨祷时，在基督降临的歌声中——在最黑暗的城市里。

Mathematics is not a spectator sport. You have to do it to understand it.

We want to build technology that everybody loves using, and that affects everyone. We want to create beautiful, intuitive services and technologies that are so incredibly useful that people use them twice a day. Like they use a toothbrush. There aren’t that many things people use twice a day.

人一旦成名，就一个朋友也没有了，这是一个很大的不幸。而尤其不幸的是自称为朋友的人也都离你而去。