Matthew 17:20

Verily - Truly; surely.

Yonder - There; in that place.

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, 1 Corinthians 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 Matthew 13:32 (note).

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 undertaking. There is a principle of vitality in the grain of seed stretching forward to great results, which illustrates the nature of faith. Your faith should be like that. This is probably the true meaning.

Ye shall say unto this mountain ... - Probably he pointed to a mountain near, to assure them that if they had such faith they might accomplish the most difficult undertakings - things that at first would appear impossible.

17:20 Because of your unbelief - Because in this particular they had not faith. If ye have faith as a grain of mustard seed - That is, the least measure of it. But it is certain, the faith which is here spoken of does not always imply saving faith. Many have had it who thereby cast out devils, and yet will at last have their portion with them. It is only a supernatural persuasion given a man, that God will work thus by him at that hour. Now, though I have all this faith so as to remove mountains, yet if I have not the faith which worketh by love, I am nothing. To remove mountains was a proverbial phrase among the Jews, andis still retained in their writings, to express a thing which is very difficult, and to appearance impossible. 21:21 ; Luke 17:6.