Ignitum Today, Father Carlos Martins: Want to hear a real demon story, one for which I can personally vouch?
A good priest friend of mine — let’s call him Fr. George — is an exorcist. When he performs an exorcism on someone for the first time, Fr. George demands that the demon reveals who his nemesis in heaven is. In other words, he asks him to reveal which saint is his “archenemy.”
The demons never want to reveal this. They never want to reveal any knowledge that might be used against them. But an exorcist will keep hammering away at this, because if he gets a valid answer, it will serve as a weapon and give him a tremendous edge. More here.