证明是一种可重复的说服实验。
A proof is a repeatable experiment in persuasion.
Leadership means making tough decisions today for a better tomorrow.
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
The world is full of broken stories, waiting to be mended.
Liberty is the only thing worth fighting for.
预测未来的最好方法就是自己创造未来。
The challenge of acting is to find the humanity in every character, no matter how different they may seem from you.
这句话其实是莎士比亚借哈姆雷特之口说的，但是霍金非常喜欢，曾在自己著作中多次引用，所以很多人误以为本句话是霍金说的。