Many theories have been advanced to account for the origin of demons. Some say demons are the offspring of angels cohabiting with women (Genesis 6:1-4). But angels are sexless beings who apparently are incapable of such unions (Matthew 20:30). Instead, “sons of God” and “daughters of men” in Genesis chapter six is an idiomatic expression for the intermingling of good people with bad people—which inevitably results in moral corruption (1 Corinthians 15:33) [see Major, 1993].
Some say demons are the spirits of wicked dead men whom God permitted to leave the hadean realm to indwell some people in harmony with His divine purposes. Still others say demons are fallen angels who were allowed to escape their confinement (cf. Jude 6) to accomplish some divine purpose. The fact of the matter is, the Bible simply does not tell us where demons came from. No legitimate or useful purpose is served by dwelling on the matter.
On the other hand, the Bible does tell us many things about demons. For example, demons are spirits (Matthew 8:16; Luke 24:39). Demons are always depicted as unclean, evil, and malevolent. They are associated with Satan’s influence (Matthew 9:34; 12:24,43,45; Luke 11:15). Demons also are shown to be conscious, intelligent entities who possess true knowledge of God and Christ. In Mark 1:24, a demon spoke to Jesus, “I know who you are—the holy one of God.” Demons exercised volition and even locomotion (Matthew 12:44-45).
Demons frequently caused physical and/or mental illness. For instance, in Matthew 9:32, the victim of demon possession experienced “dumbness,” i.e., the inability to talk. Such illnesses were distinguishable from the demons themselves (Matthew 4:24). Some say demons have never actually existed, and that the Bible account of demons is simply the superstitious, pre-scientific explanation of epilepsy and other physical or emotional disorders. But in the New Testament, a clear distinction is drawn between demons and the illnesses that a demon might cause. Some demons had superhuman strength (Mark 5:4; Acts 19:16). No reason is given in the New Testament for why some individuals were singled out for demon possession. Included were men (Matthew 9:32), women (Luke 8:2), and even children (Mark 7:30)….
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