One of the best examples of harnessing this power was Adolf Hitler. We all know what results he brought to the world and the desperate German people from the 1930's through the end of WWII with his frequency of message.
One of the worst things to happen to American Democracy and the political process in recent times was allowing "Super Packs" to influence the decision making process of voters. As an advertising professional it disgusts me that these Super Packs are not held accountable to telling the truth. Truth in advertising simply doesn't exist in politics. You don't have to prove the "facts" listed as true, you don't have to reveal your source of information, you simply get away with spreading any lie you wish to tell. The same does not hold true in commercial advertising. It is truly unfair!
One of baseball's most decorated players, Ty Cobb, spent his entire life trying to debunk the lies spread so frequently about him. A man, by those who play the game, should be revered as one of the best who ever played, is better known as the most despicable creatures who ever graced the baseball diamond. The fact remains...they are lies. Please take the time to read this recent article, which shares the true story of Ty Cobb: https://imprimis.hillsdale.edu/who-was-ty-cobb-the-history-we-know-thats-wrong/
Repetition can be a good thing. Just be aware when it used to try to motivate you in a negative way.
Sir Hook the Repetitive of Warrick