12. And what is surprising, the same thing is done even to this day by those who follow his most impure heresy. For they, after the manner of their forefather, slipping into the Church, like a pestilential and leprous disease greatly afflict those into whom they are able to infuse the deadly and terrible poison concealed in themselves. The most of these have been expelled as soon as they have been caught in their wickedness, as Simon himself, when detected by Peter, received the merited punishment.