Matthew 17:15-21

and said, “Lord, please show your tender mercy toward my son. He has a demon who afflicts him. He has epilepsy, and he suffers horribly from seizures. He often falls into the cooking fire or into the river. I brought him to your followers, but they weren’t able to heal him.” Jesus replied, “Where is your faith? Can’t you see how wayward and wrong this generation is? How much longer do I stay with you and put up with your doubts? Bring your son to me.” Then Jesus rebuked the demon and it came out of him and the boy was instantly healed! Later the disciples came to him privately and asked, “Why couldn’t we cast out the demon?” He told them, “It was because of your lack of faith. I promise you, if you have faith inside of you no bigger than the size of a small mustard seed, you can say to this mountain, ‘Move away from here and go over there,’ and you will see it move! There is nothing you couldn’t do! But this kind is cast out only through prayer and fasting.”