(The Lord:)  Since I have indicated to you now where the dwelling places of the evil and malicious souls – who are actually the personal devils – are, you should avoid them when you still feel rather weak, because there is still a danger on such places for him who is weak. He who exposes himself to danger while he is still weak, will also easily perish in danger, or at least he will not easily escape without any harm.
 Therefore, take care that you should not covet all the impure and unripe things of this world, because you are now already on the last step of the inner life’s completion, and all that is already behind you. Strife always to go forward and no more towards that which is unripe that lies behind you. Then you will easily and quickly reach the true goal of life and you will feel no more desire to look even one more time to that which is unripe that lies behind you. Did you all understand this well now?”
 The scribe said: “Lord and Master, also this has now become clear to us, and also concerning this we know now what we can expect. But, among the people, there are still so many appearances about which we still have not much clarity. So for instance I myself know in the country of the Jews several old strongholds and old houses that, maybe already since a few centuries are no more inhabited by people.
" I said: “Oh My friend, it is not always what you think, but mostly something much different. Let such infamous strongholds and farms be surrounded by a group of courageous soldiers, then I can assure you that by such occasion your otherwise so dangerous looking appearances will retreat in such a way that no soldier will in the least notice their eventual existence.
 Although, here and there are places where souls of people are residing who have deceased a long time ago, and now and then they are catching the attention of bypassing people in one way or another. These are souls who during their physical life were too much in love with their earthly possession, and in order to increase it, they also committed many injustices. Such souls who have become at the same time very materialistic, remain therefore after the falling away of their body on these places that they have loved above everything else and were precious to them during their physical life, and this often as long as every trace of their mostly so precious possession has become lost. Only then they come more and more to their senses in the beyond because they begin to realize in themselves that all the earthly and timely possession and idle thing is and was an empty illusion.
 But such souls can never degenerate into a too tangible malice, and their extremely limited and powerless existence cannot inflict any moral injury to anybody. On the contrary, the fact that now and then they are manifesting themselves, often works very well on the unbelief of many worldly person, who because of this, becomes a believer and changes his worldly life, because he becomes aware of an existence of the souls of men after the death of the body, which to him does not seem to be so particularly good and blissful."
(GGJ, Book 18, 85)
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.
Signs of the Spiritual World
Compatibility of the New Revelation with Paranormal Research