A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between proofs and the best mathematician can notice analogies between theories.

沙丘被风改变，但沙漠永远不会改变。这就是我们彼此间的爱。

现代的公众人物是拿自己私生活的非法细节让大家频打哈欠的人。

经济史告诉我们，改变是可能的，但很少是容易的。

每一个挑战都是变得更强大、更睿智的机会。