A man must always live by his work, and his wages must at least be sufficient to maintain him. They must even upon most occasions be somewhat more; otherwise it would be impossible for him to bring up a family, and the race of such workmen could not last beyond the first generation.
Adam SmithThe man scarce lives who is not more credulous than he ought to be... The natural disposition is always to believe. It is acquired wisdom and experience only that teach incredulity, and they very seldom teach it enough.
Adam Smith