HYPNOTIC REPETITION is one of the techniques used most relentlessly and profitably in propaganda and indoctrination. Three common examples.
1) Repeat a POLITICAL claim often enough and it will drown out facts. “Don’t bother me with facts. My mind is made up.”
2) Repeat a RELIGIOUS claim frequently enough and it will submerge contrary opinions, no matter how common-sensical they are.
3) Repeat an ECONOMIC claim like supply-side or trickle-down economics again and again and people will forget how few benefit from the alleged ricochet.
A critical secret to creative thinking is to avoid dogma, insisted Steve Jobs at the end of his outstandingly creative and productive life. Avoid thinking merely the thoughts of others, he added, and think critically for yourself.
For more examples see my website: http://www.propagandaandcriticalthought.com/
Better yet, add examples that you are familiar with.