"Magic is produced by the power of demons. In reality there is no power existing in the magician, for the effects are produced by the devil at the command of the magician. In the first place, demons produce effects by transferring bodies with great rapidity from one place to another. For they have power over all inferior things, natural and artificial, in this respect; and, moreover, they are endowed with wonderful agility, which enables them to pass in an instant from one place to another, however remote. Secondly, demons produce effects by the occult application of natural causes, and by accelerating their actions, for their knowledge is incredible. They understand the nature and properties of everything in the mineral, vegetable, and animal worlds, and they know where everything is. Hence they sometimes produce trees, fruits, and animals in an incredibly short space of time. They often effect cures by the occult use of medicines, or by entering the body and expelling evil humours. Thirdly, they perform prodigies by acting on the senses. The compacts between the demons and magicians are based upon engagements mutually entered into. The magician promises to obey the demon, and the demon, on his part, promises to work for him and at his bidding. The compact is sometimes entered into with great solemnity, with the demon seated on a throne, surrounded by a host of evil spirits, as attendants and witnesses." Swedenborg entertained the conviction that the world of spirits held communion with certain favoured persons in this life; and up to the period of his death, in the year 1772, he pretended to have intercourse with spirits of celestial origin and those of deceased men. Swedenborg frequently narrated the wonders of other worlds, and particularly those of the infernal regions.