17. Someone from the crowd answered him, “Teacher, I have brought to you my son possessed by a mute spirit.
18. Wherever it seizes him, it throws him down; he foams at the mouth, grinds his teeth, and becomes rigid. I asked your disciples to drive it out, but they were unable to do so.”
19. He said to them in reply, “O faithless generation, how long will I be with you? How long will I endure you? Bring him to me.”
20. They brought the boy to him. And when he saw him, the spirit immediately threw the boy into convulsions. As he fell to the ground, he began to roll around and foam at the mouth.