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I agree. This is what real ghosts are, I would call them astral "scum." By "not letting their souls go to the afterlife," they, having left their bodies, wander through the "corridors" of the astral plane in search of an opportunity to inhabit some available body in order to "continue their mission on earth." For example, as soon as a person dies, their soul leaves that body FOREVER, and a whole commotion of this astral "scum" begins around it, vying for the right to possess that body. That is why there has long been a tradition of covering mirrors in the house of the deceased, as they can reflect this astral struggle and fill the house with dark energy. In general, paganism has a very good understanding of these issues. For example, in Ancient Egypt, they learned to use this astral "scum" as zombies. This is a well-known fact. Priests possessed the art of "inhabiting" the bodies of the dead with "restless souls," which performed heavy physical labor with a primitive level of intelligence, required minimal food (mainly meat), and were absolutely obedient to the will of the priests. The zombies worked until the bodies completely decayed, as decomposition continued.
There are cases when the dead "came back to life," but these were completely different people in terms of character, and their loved ones testified to this. Moreover, the "resurrected" were cruel, with a low intellectual level, and caused great problems for their loved ones, even beating them. This is an example of these very zombies. That is, a ghost managed to inhabit the body of the deceased (in this case, through the prayers of the wife, which served as a kind of "summoning spell"), and voila - a "new" person appears, who "lives" not for long, but manages to cause a lot of trouble for those around him.
There are other types of "possession." In some LIVING people, with a weakened will, under certain circumstances, such astral "scum" can also inhabit them for a while. This usually happens if people have a weakened psyche (possessed); during severe alcohol or (less often) drug intoxication. At such moments, a person is maximally weakened in will and "opens" the way for ghosts. At the same time, the person changes appearance (rarely to the point of being unrecognizable), speaks in a voice that is not their own, and exhibits animal (inhuman) instincts, mainly directed towards finding food (meat) and aggression. Unfortunately for myself, I had the opportunity to observe such a "phenomenon" for quite a long time. I WOULDN'T WISH IT ON ANYONE! It's terrifying!