Later the disciples came to Jesus in private and asked him, “Why couldn't we drive it out?”
Jesus confronted the demon and it left the boy, and he was healed straight away.
“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.”
When he was by himself, his twelve disciples and the others who were with him asked him what the illustrations meant.
Later, when Jesus had gone indoors, his disciples asked him in private, “Why couldn't we drive the evil spirit out?”