A good world needs knowledge， kindliness， and courage； it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.
我认为预测未来的最好方法就是创造它。
定理不是偶然发现的。
这些人很少不是死于自己的所长,所以说∶事业达到顶峰就难以持久。
我们这个时代最大的挑战不是技术进步，而是道德进步。
The theatre is the most immediate way in which a human being can share with another the sense of what it is to be a human being.