After Jesus had gone into the house, His disciples asked Him privately, “Why couldn’t we drive it out?”
We have here the story of Christ casting the devil out of a child, somewhat more fully related than it was in Mat 17:14, etc. Observe here, I. Christ's return to his disciples, and the perplexity he found them in. He laid aside his robes of glory, and came to look after his family, and to enquire what was become of them.
Commenting on Mark 9:14-29
And when he was come into the house,.... Perhaps into the man's house whose child he had healed, or into some other in these parts, for the sake both of retirement and refreshment: his disciples asked him privately, why could not we cast him out?
And when he was come into the house, his disciples asked him privately, Why could not we cast him out? (6) We have need of faith, and therefore of prayer and fasting, in order to cast Satan out of that which belonged to him.