There is possibility in every difficulty.

I love to travel, but hate to arrive.

I do not share the crusading spirit of the professional atheist whose fervor is mostly due to a painful act of liberation from the fetters of religious indoctrination received in youth. I prefer an attitude of humility corresponding to the weakness of our intellectual understanding of nature and of our own being.

Nothing that I can do or say will change the structure of the universe. But maybe, by raising my voice, I can help the greatest of all causes — good will among men and peace on earth.

It is the theory that decides what can be observed.

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

The significant problems we have cannot be solved at the same level of thinking with which we created them.