The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.
The best way to predict the future is to invent it.
最危險(xiǎn)的謊言是我們對(duì)自己說(shuō)的那些。
數(shù)學(xué)是上帝用來(lái)書(shū)寫(xiě)宇宙的語(yǔ)言。