"Technology can be among the most powerful weapons in the dictator's armory. Propaganda, the suppression of the truth, particularly in democratic societies, will bring upon an age of enslavement where instead of yokes and chains, people in celebrated 'free' societies like America will be bound by the soft restraints of ignorance, incuriousness, distraction and irrationality."
"Great is truth, but still greater, from a practical point of view, is silence about truth. By simply not mentioning certain subjects, by lowering what Mr. Churchill calls an 'iron curtain' between the masses and such facts or arguments as the local political bosses regard as undesirable, totalitarian propagandists have influenced opinion much more effectively than they could have done by the most eloquent denunciation, the most compelling of logical rebuttals."
Both of these quotes are attributed to Aldous Huxley.