There is a time for daring,and there is a time for caution, and a wise man understanding which is called for

学习数学的唯一方法就是做数学。

天下很多所谓可以做的事情，未必都是可以做的啊！ 

I think it's possible for ordinary people to choose to be extraordinary.

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.