A little sincerity is a dangerous thing, and a great deal of it is absolutely fatal. Oscar Wilde.
Great liars are also great magicians. Adolf Hitler.
Even in literature and art, no man who bothers about originality will ever be original: whereas if you simply try to tell the truth (without caring twopence how often it has been told before) you will, nine times out of ten, become original without ever having noticed it. C.S. Lewis