天下最痛苦的人是发现丈夫的勇敢只是虚张声势的妻子。

To avoid criticism, do nothing, say nothing, and be nothing.

史记

Don't wait until everything is just right. It will never be perfect. There will always be challenges, obstacles and less than perfect conditions. So what. Get started now. With each step you take, you will grow stronger and stronger, more and more skilled, more and more self-confident and more and more successful.

数学中的每个问题都是一个等待解决的谜题，而乐趣就在于解决的过程。