The best way to learn something is to teach it.

I'm not afraid to take a stand. Everybody come take my hand. We'll walk this road together, through the storm.

Theorems are eternal; their proofs are ephemeral.

Quality is never an accident; it's always the result of intelligent effort.

We made gods of men and they leave us. Others make brutes of them and they fawn and are faithful.

A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.

记忆是一件棘手的事情；它既可以是祝福，也可以是诅咒。