“Don’t listen to the person who has the answers; listen to the person who has the questions.”

Learn from yesterday, live for today, hope for tomorrow.

Gravitation is not responsible for people falling in love.

When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That’s relativity.

Reality is merely an illusion, albeit a very persistent one.

When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again.

The only thing that interferes with my learning is my education.

Creativity is intelligence having fun.

What is right is not always popular and what is popular is not always right.

The only thing more dangerous than ignorance is arrogance.

Everything must be made as simple as possible. But not simpler.

You have to learn the rules of the game. And then you have to play better than anyone else.

If you want to live a happy life, tie it to a goal, not to people or objects.

The hardest thing in the world to understand is the income tax.

If we knew what it was we were doing, it would not be called research, would it?

Never memorize something that you can look up.

You never fail until you stop trying.