The most exciting, challenging and significant relationship of all is the one you have with yourself.

The right of a nation to kill a tyrant in case of necessity can never be doubted until the right of a tyrant to kill a nation has been proved.

成功的秘诀在于开始行动。

数学不是一门演绎科学——那是陈词滥调。当你试图证明一个定理时，你不仅仅是列出假设然后开始推理。你所做的是反复试验、实验和猜测。