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

The years of anxious searching in the dark, with their intense longing, their alternations of confidence and exhaustion, and final emergence into light—only those who have experienced it can understand that.

Let us not forget that human knowledge and skills alone cannot lead humanity to a happy and dignified life

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

He who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed.

Invention is not the product of logical thought, even though the final product is tied to a logical structure.

Hail to the man who went through life always helping others, knowing no fear, and to whom aggressiveness and resentment are alien

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.

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.

Once we accept our limits, we go beyond them.

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.