Mat 17:19-21 | Clarke | STEP | Verse 19 Why could not we cast him out? - They were confounded at their want of success - but not at their want of faith, which was the cause of their miscarriage! When the ministers of the Gospel find their endeavors, with respect to some places or persons, ineffectual, they should come, by private prayer, to Christ, humble themselves before him, and beg to be informed whether some evil in themselves have not been the cause of the unfruitfulness of their labors.

Matthew 17:19-21

Verse 19

Why could not we cast him out? - They were confounded at their want of success - but not at their want of faith, which was the cause of their miscarriage! When the ministers of the Gospel find their endeavors, with respect to some places or persons, ineffectual, they should come, by private prayer, to Christ, humble themselves before him, and beg to be informed whether some evil in themselves have not been the cause of the unfruitfulness of their labors. Verse 20

Because of your unbelief - Are we preachers of the Gospel? Do the things of God rest upon our minds with a deep and steady conviction? Can we expect that a doctrine which we do not, from conviction, credit ourselves, can be instrumental in our hands of begetting faith in others? So we preached, end so ye believed. The word preached generally begets in the people the same spirit which the preacher possesses. Instead of απιϚιαν, unbelief, the famous Vatican MS. and Cod. Cyprius, six others, Coptic, Ethiopic, Armenian, and Arabic, Origen, and Chrysostom, read ολιγοπιϚιαν, littleness of faith. The disciples had some faith, but not enough - they believed, but not fully.

As a grain of mustard seed - Some eminent critics think this a proverbial expression, intimating a Great Degree of faith, because removing mountains, which St. Paul, 1Cor 13:2, attributes to All Faith; i.e. the greatest possible degree of faith, is attributed here, by our Lord, to that faith which is as a grain of mustard seed. However this may be, there can be no doubt that our Lord means, as Bishop Pearce well remarks, a thriving and increasing faith; which like the grain of mustard seed, from being the least of seeds, becomes the greatest of all herbs; even a tree in whose branches the fowls of the air take shelter. See Wakefield's Comment, and the note on Mat 13:32 (note). Verse 21

This kind goeth not out but by prayer, etc. - Τουτο το γενος, this kind, some apply to the faith which should be exercised on the occasion, which goeth not out, doth not exert itself, but by prayer and fasting; but this interpretation is, in my opinion, far from solid. However, there is great difficulty in the text. The whole verse is wanting in the famous Vatican MS., one of the most ancient and most authentic perhaps in the world; and in another one of Colbert's, written in the 11th or 12th century. It is wanting also in the Coptic, Ethiopic, Syriac, Hieros., and in one copy of the Itala. But all the MSS. acknowledge it in the parallel place, Mar 9:29, only the Vatican MS. leaves out νηϚεια, fasting. I strongly suspect it to be an interpolation; but, if it be, it is very ancient, as Origen, Chrysostom, and others of the primitive fathers, acknowledged it. But while candour obliges me to acknowledge that I cannot account for the fact here alleged, that a certain class or genus of demons cannot be expelled but by prayer and fasting, while others may be ejected without them, I can give a sense to the passage which all my readers will easily understand: viz. that there are certain evil propensities, in some persons, which pampering the flesh tends to nourish and strengthen; and that self-denial and fasting, accompanied by prayer to God, are the most likely means, not only to mortify such propensities, but also to destroy them. For other remarkable circumstances relative to this case, see the notes on Mar 9:17, etc.