To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.

The more you can increase the fear of failure, the more you can motivate people to avoid it.

All human errors are impatience, a premature breaking off of methodical procedure, an apparent fencing-in of what is apparently at issue.

The power of abstraction is what allows mathematics to transcend the limits of physical reality.

最后，正如丘吉尔指出的那样，你总是可以指望美国人做正确的事情，但只有在他们尝试了其他一切之后。