Happiness is at your feet, if only you are willing to lower your head and look for it.

La revolución es como la bicicleta, si no avanzas se cae.

A man is a dangerous thing, a man who has nothing to lose is even more dangerous.

或许谁都还会有这些弱点，否则可真糟了，绝顶的聪慧也要招人嘲笑了。我一生都在研究该怎么样避免这些弱点。例如虚荣和傲慢就是属于这一类弱点。

宇宙不仅仅是星星和星系的集合；它是一个复杂的互动和现象的网络，我们才刚刚开始理解。