It is impossible to meditate on time and the mystery of nature without an overwhelming emotion at the limitations of human intelligence.

"One and one make two" assumes that the changes in the shift of circumstance are unimportant. But it is impossible for us to analyze this notion of unimportant change.

I put forward as a general definition of civilization, that a civilized society is exhibiting the five qualities of Truth, Beauty, Adventure, Art, Peace.

Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

The vitality of thought is in adventure. Ideas won't keep. Something must be done about them. When the idea is new, its custodians have fervor, live for it, and if need be, die for it.

Faith in the possibility of science, generated antecedently to the development of modern scientific theory, is an unconscious derivative from medieval theology.

Religion will not regain its old power until it can face change in the same spirit as does science.