Pseudo-Jerome — as excerpted in the Catena Aurea on Mark 9:14-29

“By this also we are taught that our faith is tottering, if it lean not on the stay of the help of God. But faith by its tears receives the accomplishment of its wishes; Wherefore it continues, When Jesus saw that the multitude came running together, he rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee come out of him, and enter no more into him.”