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.
无色的绿色念头愤怒地睡觉。
The streets were dark with something more than night.
数学之美在于它能够如此精确地描述宇宙。
一个社会离真相越远，它就越会憎恨那些说出真相的人。
If a man will begin with certainties， he shall end in doubts； but if he will be content to begin with doubts， he shall end in certainties.
Start where you are, with what you have. Make something of it and never be satisfied.