You don’t have to pee on an electric fence to learn not to do it.

The joy of solving a mathematical problem is unparalleled; it is a moment of pure intellectual triumph.

生命是一场梦，而梦，终究是梦。

The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.

让生活从此变成一首欢乐的诗。