There is only one real sin, and that is to persuade oneself that the second-best is anything but the second-best.

耳朵是负责听的，听了之后再加以审察，这叫做聪明。

定理是永恒的；它们的证明是短暂的。

Never stop learning—the moment you think you know everything is the moment you fall behind.

森林不属于我们；我们属于森林。