The most important skill to learn is how to learn.

谄媚像九尾狐，灵巧像百舌鸟，可悲啊，使七尺之躯蒙羞。暴戾如三脚老虎，恶毒如两头蛇，可惜你的心已败坏。

The writer must believe that what he is doing is the most important thing in the world. And he must hold to this illusion even when he knows it is not true.

风俗习惯是人类生活的重要指南。

Parents wonder why the streams are bitter, when they themselves have poisoned the fountain.