我为我所做的感到快乐和自豪,但从未完全满足。
I am happy and proud of what I have done, but not completely satisfied.
The past is never dead. It's not even past.
数学的本质不仅在于解决问题,还在于提出正确的问题。
Writing is a way of making the past present.
在白天对什么都不动感情是极为容易的, 但在夜晚就是另外一回事。