The Pulpit Commentary - Matthew 17:20
The power of faith. This was the comment of our Lord on the failure of the disciples to cure the lunatic boy, and on his own subsequent success. The difference was accounted for by the fact that the disciples had not faith, while Christ possessed it. On another occasion, when there was no question of any attempt of his disciples, our Lord answered the amazement caused by one of his miracles by pointing in a similar way to the power of faith ( Matthew 21:21 ). I. THE FAITH . 1 .... read more
The Pulpit Commentary - Matthew 17:20
Because of your unbelief. The Revised Version adopts the reading, little faith, in accordance with the best authorities; but it looks like a softening of the original term "unbelief," which corresponds better with Christ's own censure, "faithless generation." Jesus gives two reasons for the apostles' failure, one connected with their own moral condition, and one ( Matthew 17:21 ) derived from the nature of the demons exorcised. They had, indeed, shown some faith by making even the... read more