Mark 9:17-19

New Revised Standard Version, Anglicised Catholic Edition

¹⁷ Someone from the crowd answered him, ‘Teacher, I brought you my son; he has a spirit that makes him unable to speak; ¹⁸ and whenever 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, but they could not do so.’ ¹⁹ He answered them, ‘You faithless generation, how much longer must I be among you? How much longer must I put up with you? Bring him to me.’