君子的学习，一定要喜欢提问。提问和学习是相辅相成的。不学习就无法产生疑问，不提问就无法扩展知识。

To live is the rarest thing in the world. Most people exist, that is all.

The art of algorithm design is not just in solving problems, but in discovering new ways to think about them.

你无法前瞻性地连接这些点；你只能回顾性地连接它们。