If demons existed, they would be the work of God; but would it he just on the part of God to have created beings condemned eternally to evil and to misery? If demons exist, it is in your low world, and in other worlds of similar degree that they are to be found. They are the human hypocrites who represent a just God as being cruel and vindictive, and who imagine that they make themselves agreeable to Him by the abominations they commit in His name.
p. 105. - The Spirits' Book