The world is a great clock, and we are the hands.

"The essence of mathematics is not to make simple things complicated, but to make complicated things simple."

I'm not afraid of dying, I'm afraid of not trying.

唯一值得被称为自由的自由是追求我们自己的幸福，以我们自己的方式，只要我们不试图剥夺他人的自由，或妨碍他们争取幸福的努力。