Matthew 17:14-21

When they approached the crowd, a man came to Jesus, and kneeled before him. “Lord, please have mercy on my son,” he said. “He loses his mind and suffers such terrible fits that he often falls in the fire or into water. I brought him to your disciples but they couldn't heal him.” “You people refuse to trust me, and are so corrupt!” Jesus responded. “How long do I have to remain here with you? How long do I have to put up with you? Bring him here to me!” Jesus confronted the demon and it left the boy, and he was healed straight away. Later the disciples came to Jesus in private and asked him, “Why couldn't we drive it out?” “Because you don't trust enough,” Jesus told them. “I tell you, even if your trust was as small as a mustard seed, you could say to this mountain, ‘Move from here to there,’ and it would move. Nothing would be impossible for you.”