The immense majority of intellectually eminent men disbelieve in the Christian religion, but they conceal the fact in public, because they are afraid of losing their incomes.

The three main extra-rational activities in modern life are religion, war, and love. all these are extra-rational, but love is not anti-rational, that is to say, a reasonable man may reasonably rejoice in its existence

The mind is a strange machine which can combine the materials offered to it in the most astonishing ways.

Religion is based, I think, primarily and mainly upon fear.

While economics is about how people make choice, sociology is about how they don't have any choice to make.

To save the world requires faith and courage: faith in reason, and courage to proclaim what reason shows to be true.

For my part I distrust all generalizations about women, favorable and unfavorable, masculine and feminine, ancient and modern; all alike, I should say, result from paucity of experience.