" We know the major conditions wherein this large populace may turn upon its keepers -
One: When they find a leader. This is the most volatile threat to the powerful; they must retain control of leaders.
Two: When the populace recognises its chains. Keep the populace blind and unquestioning.
Three: When the populace perceives a hope of escape from bondage. They must never even believe that escape is possible! "

― Frank Herbert , Children of Dune (Dune, #3)