"Writing is like making love. Don’t worry about the orgasm, just concentrate on the process."
我不害怕跌倒,因为我知道我会再次站起来。
A man who dares to waste one hour of time has not discovered the value of life.  
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.