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.
生活是一系列的时刻,而我们有责任使它们有意义。