“To the primitive mind, everything is either friendly or hostile; but experience has shown that friendliness and hostility are not the conceptions by which the world is to be understood.”

“Moreover, the attitude that one ought to believe such and such a proposition, independently of the question whether there is evidence in its favor, is an attitude which produces hostility to evidence and causes us to close our minds to every fact that does not suit our prejudices.”

“The secret of happiness is this: let your interest be as wide as possible and let your reactions to the things and persons who interest you be as far as possible friendly rather than hostile. ”

“The world that I should wish to see would be one freed from the virulence of group hostilities and capable of realizing that happiness for all is to be derived rather from co-operation than from strife. I should wish to see a world in which education aimed at mental freedom rather than imprisoning the minds of the young in rigid armor of dogma calculated to protect them through life against the shafts of impartial evidence.”

“...It is necessary for the average citizen, if he wishes to make a living, to avoid incurring the hostility of certain big men. And these big men have an outlook - religious, moral, and political - with which they expect their employees to agree, at least outwardly.”

“The fundamental concept in social science is Power, in the same sense in which Energy is the fundamental concept in physics.”

“If everything has a cause, then God must have a cause. If there can be anything without a cause, it may just be the world as God...”