Unless one's philosophy is all-inclusive, nothing can be understood.

Could anyone fail to be depressed by a book he or she has published? Don't we always outgrow them the moment the last page has been written?

The volumes which record the history of the human race are filled with the deeds and the words of great men ... [but] The Twentieth Century Woman ... questions the completeness of the story.

Leisure for reverie, gay or somber, does much to enrich life.

Every great creative idea, formulated as a philosophy, has a social setting - in time, in a geographical location, in a political economy, in a matrix of interests and knowledge. It is not a free-swinging phenomenon like a balloon without moorings. It is not produced in a vacuum and, being creative, it does not work in a vacuum. Nurtured on things experienced and things known, it reaches out toward the unknown like a flower on a stalk growing out of the soil.

Every revolution has its counter-revolution.

In matters pertaining to the care of life there has been no marked gain over Greek and Roman antiquity.