Those in possession of absolute power can not only prophesy and make their prophecies come true, but they can also lie and make their lies come true. --Eric Hoffer
When I was in high school, we had to read The True Believer by Eric Hoffer. It's as relevant today as it was in the 1950's when first published. I suspect school age kids don't read anything so incendiary today: Hoffer was not a great supporter of religion and compared Paul in Christianity to Hitler. The main thesis of his book (this taken from Wikipedia) was, for a true believer, "that substance of any particular group is less important than being part of an energized movement."