The French probably invented the very notion of discretion. It's not that they feel that what you don't know won't hurt you; they feel that what you don't know won't hurt them. To the French lying is simply talking.
Art is something greater and higher than our own skill or knowledge or learning. That art is something which, though produced by human hands, is not wrought by hands alone, but wells up from a deeper source, from a man's soul.