Repetition makes lies seem true, but repetition also makes truth seem true. All persuasion (and indoctrination) happens through repetition, whether in a classroom setting, a forum like this one, or in sales.
This realization is also deeply depressing, because it means you're doomed to repeat yourself over and over if you want to persuade people.
Let's take Noam Chomsky for instance. He gives more than a hundred talks every year for the past 50 years. He has written dozens (if not a hundred) books, given thousands of interviews. His message is always the same. Because after you've figured out what your best and most persuasive arguments are the only thing left to do is repeat yourself over and over. Every day is groundhog day. Sometimes, the work is just repeating something until it becomes true.
Josh Beckman