Constant

"All propaganda must be so popular and on such an intellectual level, that even the most stupid of those toward whom it is directed will understand it... Through clever and constant application of propaganda, people can be made to see paradise as hell, and also the other way around, to consider the most wretched sort of life as paradise."
--Adolf Hitler (1889-1945)
German Nazi Dictator, 1935
Source: Mein Kampf, p. 197. 14th Edition.