All my work has come about through a change in my earlier opinion of religion.

Of course it must, and our scientific men must be criticized boldly. They will not feel comfortable when you and I are through with them.

The lure of happiness and the fear of pain . . . are the two forces which have through untold millenniums kept what we usually call life from destruction by the ever encroaching outside forces of destruction.

Science is knowledge arranged and classified according to truth, facts, and the general laws of nature.

Prayer may be elevating if combined with work, and they who labor with head, hands or feet have faith and are generally quite sure of an immediate and favorable reply.

We must return to nature and nature's god.

Heredity: the traits that a disobedient child gets from the other parent.