In the real world we know that evil spirits are able to bring about effects which cannot be brought about by any other created causes, and this preternatural activity could, if called upon, explain all that needs to be explained in the phenomena of the occult, spiritism and the like which is left unexplained by fraud. The discussion of magic in the Bible certainly suggests that the real-world necromancers, magicians, and mediums encountered in its pages are dependent upon evil spirits for whatever effective powers they may possess.
As either hand may rightly clutch.
In the taking of it breathe
Prayer for all who lie beneath.
Not the great nor well-bespoke,
But the mere uncounted folk
Of whose life and death is none
Report or lamentation.
Lay that earth upon thy heart,
And thy sickness shall depart!