人类需要悲伤，正如需要欢乐一样。
The human being needs sadness as much as he needs joy.
Golf is a puzzle without an answer. I've played the game for 50 years and I still haven't the slightest idea of how to play.
那时我太老了，现在反而年轻了。
最伟大的故事是那些留下伤痕的故事。
To do mathematics is to engage in an act of creation and discovery simultaneously.
