The world is made of words, and those words are so powerful that they can create worlds.

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

什么都会的人，很少有自己所真正精通的东西，整天沉心思虑的人，往往遇事难以下决断。

地理学的研究是对地球作为人类居住地的研究。

生存的唯一方法就是不断前进。