My daughter's mental illness can cause her to be delusional and hear voices when under stress. She has stated that they never tell her anything "good" or "positive" but the voices do attempt to convince her to hurt herself or others. It is scary. It is terrifying to see my dear child in this delusional state as she doesn't even look much like my daughter. I don't believe in a devil or anything like that, but I suppose those who do might say she looks possessed.
Wouldn't it be great if the voices told her to study hard, do the dishes and give mummy hugs and kisses?