Joseph Benson's Commentary of the Old and New Testaments - Matthew 17:19-20
Matthew 17:19-20. Then came the disciples to Jesus Namely, the nine disciples, who had been left with the multitude, when Jesus and the three others went up to the mount. They were silent before the multitude, ashamed, it seems, that they could not cast out this evil spirit, and, perhaps, vexed lest through some fault of their own they had lost the power of working miracles, formerly conferred upon them. But when they came with Jesus to their lodging, they asked the reason why they could... read more
Albert Barnes' Notes on the Whole Bible - Matthew 17:19
Then came the disciples ... - This inquiry was made in some house to which they retired near the place where the miracle was performed (Mark). Jesus told them, in reply, that it was because of their unbelief that they had not been able to cast him out. They were appalled by the difficulty of the case and the obstinacy of the disease. Their faith would not have made it more easy for God to work this miracle, but such was his will - such the way in which he worked miracles, that he required faith... read more