Racism is America's greatest disease, racism is a disease of the white man.

I never think of the future. It comes soon enough. When visiting the U.S. from Germany for a winter academic stay.

Imagination is the highest form of research.

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.

The fear of death is the most unjustified of all fears, for there's no risk of accident for someone who's dead.

The pioneers of a warless world are the young men (and women) who refuse military service.

It would be better if you began to teach others only after you yourself have learned something.