Mark 9:18-22

18Whenever 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.” 20So 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. 21Jesus asked the boy’s father, “How long has he been like this?” “From childhood,” he answered. 22“It has often thrown him into fire or water to kill him. But if you can do anything, take pity on us and help us.”