If you can’t explain it simply, you don’t understand it well enough.

Coincidence is God’s way of remaining anonymous.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

Strive not to be a success, but rather to be of value.

No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

I have no special talent. I am only passionately curious.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

Life is like riding a bicycle. To keep your balance, you must keep moving.