A selection of verses showing what the Bible says about demons.
Demon-possessed people are healed in the same way as those with every other illness:
24 The report about him went out into all Syria. They brought to him all who were sick, afflicted with various diseases and torments, possessed with demons, epileptics, and paralytics; and he healed them.
A dumb man is said to be demon-possessed:
32 As they went out, behold, a mute man who was demon possessed was brought to him.
When a demon-possessed man is cured, he is described as being in his right mind:
15 They came to Jesus, and saw him who had been possessed by demons sitting, clothed, and in his right mind, even him who had the legion; and they were afraid.
John the Baptiser's unusual habit of not eating bread or drinking wine is referred to as having a demon:
33 For John the Baptiser came neither eating bread nor drinking wine, and you say, ‘He has a demon.’
Jesus Christ is accused of having a demon when he accuses the Jews of wanting to kill him, and when he says things they think are impossible:
20 The multitude answered, “You have a demon! Who seeks to kill you?”
52 Then the Jews said to him, “Now we know that you have a demon. Abraham died, as did the prophets; and you say, ‘If a man keeps my word, he will never taste of death.’
Insanity is thought to be caused by a demon:
20 Many of them said, “He has a demon, and is insane! Why do you listen to him?”
Anyone with a mental illness or inexplicable behaviour is said to have a demon.