Customs, morals--is there a difference? Auteur: Robert A. Heinlein Copy Quote More from Robert A. Heinlein “Sin lies only in hurting others unnecessarily. All other "sins" are invented no…” “One man's theology is another man's belly laugh.” “Little girls, like butterflies, need no excuse,” “Our behavior is different. How often have you seen a headline like this?--TWO D…”