数学证明的优雅在于它的简洁和清晰。
The elegance of a mathematical proof is in its simplicity and clarity.
你无法回到过去改变开始,但你可以从现在开始改变结局。
心灵不是要填满的容器,而是要点燃的火焰。
I think you should be able to do whatever you want as long as you're not hurting anybody.
The only way to discover the limits of the possible is to go beyond them into the impossible.