I'm not a genius. I just work harder than others.

The most profound ideas in mathematics often arise from the simplest observations.

The people who are crazy enough to think they can change the world are the ones who do.

All God wants of man is a peaceful heart.

We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

The only real voyage of discovery consists not in seeking new landscapes, but in having new eyes.