I'm not a smart man, but I know what love is.

The more you do, the more you learn. The more you learn, the more you can do.

历史上最坏的罪恶往往都来自那些自以为是在打击罪恶的人。留心自己打击罪恶的想法。

I became insane, with long intervals of horrible sanity.

Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

The perfection of machinery is to produce the desired effect with the least possible friction and waste.