There are only two things in life that are busy living and dying.
數(shù)學(xué)是一種創(chuàng)造性的努力，就像藝術(shù)或音樂一樣。
I think that the most important thing is to be true to yourself and to be honest with yourself.
A good world needs knowledge， kindliness， and courage； it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.