The Disciples’ Failure to Heal

14 When they came to the crowd, a man came to him, knelt before him, 15 and said, “Lord, have mercy on my son, because he has seizures and suffers terribly, for he often falls into the fire and into the water. 16 I brought him to your disciples, but they were not able to heal him.” 17 Jesus answered, “You unbelieving and perverse generation! How much longer must I be with you? How much longer must I endure you? Bring him here to me.” 18 Then Jesus rebuked the demon and it came out of him, and the boy was healed from that moment. 19 Then the disciples came to Jesus privately and said, “Why couldn’t we cast it out?” 20 He told them, “It was because of your little faith. I tell you the truth, if you have faith the size of a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; nothing will be impossible for you.” 21 [fn]