Once we accept our limits, we go beyond them.

Science can flourish only in an atmosphere of free speech.

I speak to everyone in the same way, whether he is the garbage man or the president of the university.

A happy man is too satisfied with the present to dwell too much on the future.

The great moral teachers of humanity were, in a way, artistic geniuses in the art of living.

Man would indeed be in a poor way if he had to be restrained by fear of punishment and hopes of reward after death.

Only those who attempt the absurd can achieve the impossible.

It is better to believe than to disbelieve; in so doing you bring everything to the realm of possibility.

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

A ship is always safe at the shore – but that is NOT what it is built for.

You never fail until you stop trying.

The only source of knowledge is experience.

We cannot solve our problems with the same thinking we used when we created them.

Logic will get you from A to B. Imagination will take you everywhere.

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

Insanity is doing the same thing, over and over again, but expecting different results.

It’s not that I am so smart, it’s just that I stay with problems longer.

Weakness of attitude becomes weakness of character.

In the middle of difficulty lies opportunity.