According to the evangelists, unclean spirits could cause the inability to speak, hear, or see; they could induce epilepsy-like symptoms; and they could lead humans to insanity and even to self-destruction. Demons were a constant threat. It is therefore no surprise to find that in the Gospels, exorcisms are a central part of Jesus’s ministry. The book of Acts relates how the apostles continued to heal the sick and cure those who were tormented by unclean spirits.