The Lord explains the nature of possession
Earth and Moon, chap. 58
"Most of you have read about peculiar cases of possession, but you do not have the particular knowledge of how these possessions come about, whence and under what circumstances. For your information, here is a dramatic portrayal.
Satan, who has a multitude of evil followers, has his cohorts come among human beings at certain times. They are given the task of leaving no stone unturned so as to entrap any soul for the court of the prince of all evil and lies. The evil ones thereupon proceed on their secret path upwards to the upper world. They mask their intentions as adroitly as possible, so that any good spirit which they might encounter will not become suspicious. Should such a good spirit ask for a reason, the evil ones will give a respectable answer and implore their mighty keeper to let them ascend, so that they may find the opportunity to remedy many of their past evils and better themselves.
In the kingdom of good and evil spirits, nothing is more respected than free will, provided that the intentions of these spirits be not too evil. They will be allowed to ascend, of course, under constant secret observation. Since this permission is mostly abused, they cannot object when they return to more unpleasant conditions than those in which they were before.
What do these evil ones do when they ascend to the upper world? Some of these spirits of human beings, which, during their earthly life, were very haughty and rich landowners, proceed to their castle, if it still exists. These they haunt, because they want to make people aware that there is a treasure hidden in the castle. When these people become aware of this, they implore the evil spirit to show them where and when to dig in order to find the treasure.
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