Mathematics is the art of giving the same name to different things.

Do just once what others say you can't do, and you will never pay attention to their limitations again.

The only thing I can rely on is my own perception and that is always changing.

知识可以传达，但智慧不能。人们可以找到智慧，活在其中，通过智慧得到坚定，创造奇迹，但却无法传达和教授。