To understand is to know what causes what.

Libraries were full of ideas—perhaps the most dangerous and powerful of all weapons.

我们都在寻找某样东西，即使我们不知道它是什么。

Ambition leads me not only farther than any other man has been before me, but as far as I think it possible for man to go.

释义：世间繁杂的事情看之不尽，天下的书籍读之不尽，世界的道理参悟不尽。