数学的快乐来自于复杂事物变得简单的清晰时刻。

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.

The march of invention has clothed mankind with powers of which a century ago the boldest imagination could not have dreamt.

The study of mental processes requires both experimental and comparative methods.

世界的未来在于城市。

译文：一百里的路程，走到九十里也只能算是才开始一半而已。

生活是一系列的时刻，而我们有责任使它们有意义。