First, a sign that a person is possessed is if they speak in a language they have never learned. This is different from speaking in tongues, which is a religious language and not a possession. The second way is to know and reveal that the person has no earthly way of knowing. The person may not know things they knew before or not know how to do something they should know how to do. The third way is physical strength that goes beyond the person's natural personality or physical makeup. They may be much stronger than they appear or become considerably stronger. The last way is a strong dislike for God, the Virgin Mary, the cross or other Catholic figures in the Catholic world.