The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

如果你把自己看的很轻，你就会飞的更高！

一本好书是作者与读者之间的对话。

懦怯囚禁人的灵魂，希望可以令你感受自由。强者自救，圣者渡人。