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最成功的人是那些擅長備用計劃的人。

殖民地是一個新人類計劃將被測試的地方，在那里一個無國界、無種族、無國家和無階級世界的夢想將被實現。

真相是，生活既美妙又可怕，既迷人又恐怖，既甜蜜又苦澀，這就是一切。

教育的首要目標是培養能夠做新事情的人，而不僅僅是重復前幾代人所做的事情。

自由并不意味著擺脫某物，而是能夠自由地去做某事。

Democracy... while it lasts is more bloody than either aristocracy or monarchy. Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There is never a democracy that did not commit suicide.

A good mathematician is someone who can see analogies between theorems; a great mathematician is someone who can see analogies between analogies.

人生苦短，何必在意別人的看法。