You can think of this nagging inner voice as sort of the brain's equivalent of the Catholic Church, if you're an Austrian like me, or the super-ego, if you're Freudian, or your mother, if you're Jewish.
It turns out that in the 1450s, the Catholic Church needed money, and so they actually hand-wrote these things called indulgences, which were forgiveness’s on pieces of paper.
Well, I'm not even going to address the clearly irrational positions of people like the Catholic Church, who think somehow that if you give out condoms, everyone's going to run out and have sex.