What the world needs is not redemption from sin but redemption from hunger and oppression; it has no need to pin its hopes upon Heaven, it has everything to hope for from this earth.

The content of physics is the concern of physicists, its effect the concern of all men.

He who confronts the paradoxical exposes himself to reality.

A story has been thought to its conclusion when it has taken its worst possible turn.

What was once thought can never be unthought.