"The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter."

The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'

数学的乐趣在于努力理解的过程。

解释：评价一个人时，不能因为一点过失就抹杀他的功劳。