The gospels record the boy's horrible symptoms: severe convulsions, foaming at the mouth, grinding of the teeth, and general rigidity of body. Due to sudden attacks, he often fell into the fire and into the water. Another overwhelming symptom was deafness and dumbness. He could utter only inarticulate sounds, though he possessed all the necessary organs for speech. All of his problems came as the result of his miserable, possessed condition, and they left him so emaciated that all life seemed to be draining from him.

Yet, nothing is too hard for Jesus Christ to conquer, no matter how powerful a demon seems to be. After rebuking the faithless and perverse generation, including the scribes and Pharisees, Jesus rebukes the demon, and it departs from him (Matthew 17:18; Mark 9:20, 25-27; Luke 9:42; see Zechariah 3:2). The demon dares not disobey Jesus' order not to re-enter because it recognizes His authority over it.

From then on, the boy is free of the demon. Jesus takes the boy's hand and delivers him to his father, bringing calmness, peace, and order in place of the disruption that preceded the exorcism. His spiritual power to heal had overcome the demonic force that caused the boy to suffer.