American traditions and the American ethic require us to be truthful, but the most important reason is that truth is the best propaganda and lies are the worst. To be persuasive we must be believable; to be believable we must be credible; to be credible we must be truthful. It is as simple as that.
Bio: John Wycliffe was an English scholastic philosopher, theologian, Biblical translator, reformer, seminary professor at Oxford. He was an influential dissident within the Roman Catholic priesthood during the 14th century.