The disciples of Jesus were not able to heal the boy who had a dumb spirit because
Answer Details
The disciples of Jesus were not able to heal the boy who had a dumb spirit because they had no faith. When the father of the boy asked Jesus to heal him, Jesus replied, "If you can believe, all things are possible to him who believes." The boy's father then cried out, "Lord, I believe; help my unbelief!" Jesus rebuked the unclean spirit and the boy was healed. This incident highlights the importance of faith in performing miracles, and the need for a strong belief in God's power to overcome obstacles.