Demons are fallen angels; cosmic entities who manipulate humanity at every and any level possible. They pretend to be ghosts, gods, or any other supernatural entity that can lead someone away from the truth. Their only goal is to kill, steal and destroy. They whisper to you, enticing you to sin when you otherwise would not have, doing their best work when no one is paying attention.
Have you ever had a random thought that stopped you in your tracks, causing you to question whether it was in fact your own? Something vile, violent, or otherwise uncharacteristic of your nature?