Spoken by a good actor - and every great preacher, every successful advocate and politician is, among other things, a consummate actor - words can exercise an almost magical power over their hearers. Because of the essential irrationality of this power, even the best-intentioned of public speakers probably do more harm than good. When an orator, by the mere magic of words and a golden voice, persuades his audience of the rightness of a bad cause we are properly shocked. We ought to feel the same dismay whenever we find the same irrelevant tricks being used to persuade people of the rightness of a good cause. The belief engendered may be desirable, but the ground for it are intrinsically wrong, and those who use the devices of oratory for instilling even right beliefs are guilty of pandering to the least creditable elements in human nature. By exercising their disastrous gift of the gab, they deepen the quasi-hypnotic trance in which human beings live and from which it is the aim and purpose of all true philosophy, all genuinely spiritual religion to deliver them. Moreover, there cannot be effective oratory without over-simplification. But you cannot over-simplify without distorting the facts. Even when he is doing his best to tell the truth, the successful orator is ipso facto a liar.
- Aldous Huxley, The Devils of Loudun (emphasis mine)