自动机和形式语言的研究对于理解计算的极限是基础性的。

别难过……世界上有许多人还不知道他们到底是谁或什么。

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

如果不到达印度，绝不向东返回一步。宁愿向西而死，怎能向东而生！

I'm not a smart man, but I know what love is.

和一个道德品质败坏的人，无法完成一桩好交易。