Mark 9:18-20

Revised Standard Version Catholic Edition

¹⁸ and wherever it seizes him, it dashes him down; and he foams and grinds his teeth and becomes rigid; and I asked your disciples to cast it out, and they were not able.” ¹⁹ And he answered them, “O faithless generation, how long am I to be with you? How long am I to bear with you? Bring him to me.” ²⁰ And they brought the boy to him; and when the spirit saw him, immediately it convulsed the boy, and he fell on the ground and rolled about, foaming at the mouth.