铁蛋儿的问题，不是他不识字，也不是他不会思考，而是他不知道什么是思考，并且将其与感觉相混淆。
The problem isn't that Johnny can't read. The problem isn't even that Johnny can't think. The problem is that Johnny doesn't know what thinking is; he confuses it with feeling.
There are no permanent trends, only permanent users.
译文：不害怕老虎生了三张口会吃人，就担心世间的人会有两面的心思。赏析：心口不一的人，表面上对人笑脸相迎，背地里却干着损人利己的事。
Mathematics is not a spectator sport. You have to do it to understand it.
"History is not the story of strangers, aliens from another realm; it is the story of us had we been born a little earlier."
Limiting beliefs are the prisons of the mind, and learning is the key to freedom.