数学的乐趣在于努力理解的过程。

登山不论遇到什么艰难险阻都不停止脚步，就一定能够登上山顶。

"The best way to find out if you can trust somebody is to trust them."

The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do.