A man approaches Jesus and asks him to heal his son who suffers from seizures. Jesus rebukes the demon afflicting the boy and heals him. When the disciples ask why they could not heal the boy, Jesus tells them it was because of their lack of faith, even a small amount of faith could perform great feats. He compares the kingdom of heaven to a mustard seed that, though small, grows into a large plant, demonstrating how a little faith can accomplish much.