Matthew 17:15-21

“Lord, have mercy on my son, for he is a lunatic (moonstruck) and suffers terribly; for he often falls into the fire and often into the water. And I brought him to Your disciples, and they were not able to heal him.” And Jesus answered, “You unbelieving and perverted generation, how long shall I be with you? How long shall I put up with you? Bring him here to Me.” Jesus rebuked the demon, and it came out of him, and the boy was healed at once. Then the disciples came to Jesus privately and asked, “Why could we not drive it out?” He answered, “Because of your little faith [your lack of trust and confidence in the power of God]; for I assure you and most solemnly say to you, if you have [living] faith the size of a mustard seed, you will say to this mountain, ‘Move from here to there,’ and [if it is God’s will] it will move; and nothing will be impossible for you. [Mark 11:23; Luke 17:6; 1 John 5:14] [But this kind of demon does not go out except by prayer and fasting.]”