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 17:20
As a grain of mustard-seed - See the notes at Matthew 13:31-32. The mustard-seed was the smallest of all seeds. It has been supposed by some, therefore, that he meant to say, If you have the smallest or feeblest faith that is genuine, you can do all things. The mustard-seed produced the largest of all herbs. It has been supposed by others, therefore, to mean, If you have increasing, expanding, enlarged faith, growing and strengthening from small beginnings, you can perform the most difficult... read more