Exorcism in a dream signifies that the person may need to get rid of some old memories and feelings. It is important to explore the feelings that you are trying to exorcise.
Also, discovering a ghost or an evil spirit that needs to be exorcised in your dream may be a sign that something is off. If you feel like you are being watched or followed by an unknown person, consider meeting with a therapist or someone you can talk to.
If you are dreaming about exorcism, it could be a warning that you are being manipulated by a person or group who has bad intentions. You may also feel like an evil spirit is trying to take over your thoughts.