everyone have a guardian angel and sometimes maybe a demon can be your guardian angel. surprisingly you got both. the angel would protect you and stop you when you're about to die or hurt yourself (like if you're walking on the street and you suddenly stop and a car sped right in front of you and you felt like you were being stopped by someone). on the other hand your guardian devil tries to kill or hurt you. you cannot see and hear your Guardians but you can summon them through a ritual

you were in the kitchen making a sandwich. you suddenly got some intrusive thoughts about stabbing yourself

angel: NO! hey stop with the intrusive thoughts!

demon: nah