永远原谅你的敌人,没有什么比这更让他们恼火的了。
The beauty of mathematics lies in its ability to describe the world in a precise and elegant way.
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.
试图阻止知识前进是没有好处的。无知永远不比知识好。
抽象的力量使数学能够超越物理现实的限制。
If you borrow something, try to return it in better shape than you received it. Clean it, sharpen it, fill it up.