No matter what he does and says, he will always give himself away. Demons are too full of hate and rage to be too clever. Don’t overestimate them. That might be as bad as underestimating them. And if you call him by name, he must answer you, so he’s not likely to try a disguise again.
Perhaps they could be (smart as angels), but their state of mind interferes intelligence. It interferes with their observations, and their conclusions. It interferes with everything that they do. Theirs is a hideous predicament. They refuse to admit that they have lost.
- Shmarya, Of Love and Evil -
Demons and Their Ways