The most dangerous thought you can have as a creative person is to think you know what you're doing.
计算复杂性的研究不仅仅是关于解决问题,还在于理解可计算性的极限。
Concerning the gods, I cannot know either that they exist or that they do not exist, nor what form they might have, for there is much to prevent one's knowing: the obscurity of the subject and the shortness of man's life.