Every mathematical problem is a window into a deeper understanding of the world.
最重要的事是享受生活——快乐——这才是最重要的。
Green and low-carbon development is not a multiple-choice question, but a must-answer question.
Every step you take in the wild is a step towards understanding yourself better.
墨翟我上没有侍奉国君的差事,下没有耕田种地的艰难,我怎么敢放弃读书呢? 
If you're not failing occasionally, you're not pushing hard enough.