“You are right in speaking of the moral foundations of science, but you cannot turn around and speak of the scientific foundations of morality.”

“It is our American habit if we find the foundations of our educational structure unsatisfactory to add another story or wing.”

“In scientific thinking are always present elements of poetry. Science and music requires a thought homogeneous.”

“I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.”

“It seems to me that the idea of a personal God is an anthropological concept which I cannot take seriously. I also cannot imagine some will or goal outside the human sphere... Science has been charged with undermining morality, but the charge is unjust. A man's ethical behavior should be based effectually on sympathy, education, and social ties and needs; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.”

“Morality is of the highest importance -- but for us, not for God.”

“Force always attracts men of low morality.”