In “The Screwtape Letters”, C.S. Lewis dialog between a senior devil and his nephew in training, makes clear, the most important deception is to convince humans that the devils don’t exist.
Thus, nothing to be warry of....
” the most important deception is to convince humans that the devils don’t exist.”
So true, so true.
They try to hide as that way they can influence us without us knowing it. When we become aware of them, it ruins their plans, and they get angry. But you must be careful as there are excellent imitators. Discernment is sometimes very difficult.