The stranger is close to us, insofar as we feel between him and ourselves common features of a national, social, occupational, or generally human, nature. He is far from us, insofar as these common features extend beyond him or us, and connect us only because they connect a great many people.

未来属于科学，也属于那些与科学为友的人。

实现真正自由的唯一途径是通过自律。

User thinking is more important than traffic thinking.

没有熟练的操作者，最先进的机械也毫无意义。

I have to be alone very often. I'd be quite happy if I spent from Saturday night until Monday morning alone in my apartment. That is how I refuel.

数学的本质在于它的自由。