15 As soon as all the people saw Jesus, they were overwhelmed with wonder and ran to greet him.
16 "What are you arguing with them about?" he asked.
17 A man in the crowd answered, "Teacher, I brought you my son, who is possessed by a spirit that has robbed him of speech.
18 Whenever it seizes him, it throws him to the ground. He foams at the mouth, gnashes his teeth and becomes rigid. I asked your disciples to drive out the spirit, but they could not."
19 "You unbelieving generation," Jesus replied, "how long shall I stay with you? How long shall I put up with you? Bring the boy to me."
20 So they brought him. When the spirit saw Jesus, it immediately threw the boy into a convulsion. He fell to the ground and rolled around, foaming at the mouth.
21 Jesus asked the boy's father, "How long has he been like this?""From childhood," he answered.