(30) With what comparison shall we compare it?--Literally, By what parable shall we set it forth? The question which introduces the parable is in St. Mark and St. Luke, but not in St. Matthew. It gives us the impression of a question asked, in order to put the minds of the hearers on the stretch, so that they might welcome the answer.

Verses 30-32. - Whereunto shall we liken the kingdom of God? or with what comparison shall we compare it! In the first clause of this verse the best authorities give πῶς for τίνι, How shall we liken the kingdom of God? and in the second clause, instead of the Greek of which the Authorized Version is the rendering, the best-approved reading is (τίνι αὐτὴν παραβολῇ θῶμεν), in what parable shall we set it forth? Our Lord thus stimulates the intellect of his hearers, by making them his associates, as it were, in the search for appropriate similitudes (see Dr. Morison, in loc.). The kingdom of God, that is, his Church on earth, is like a grain of mustard seed. By this image our Lord shows the great power, fertility, and extension of the Church; inasmuch as it started from a very small and apparently insignificant beginning, and spread itself over the whole world. It is not literally and absolutely true that the grain of mustard seed is less than all seeds. There are other seeds which are less than it. But the expression may readily be allowed when we compare the smallness of the seed with the greatness of the results produced by it. It is one of the least of all seeds. And so the preaching of the Gospel and the establishment of the Church was one of the smallest of beginnings. Perhaps the well-known pungency of the seed of the mustard plant may suggest the quickening, stimulating power of the Gospel when it takes root in the heart. The mustard plant shoots out large branches, which are used as fuel in some countries, quite large enough for shadow for the birds. A traveler in South America says that it grows to so large a tree upon the slopes of the mountains of Chili that he could ride under its branches.

4:21-34 These declarations were intended to call the attention of the disciples to the word of Christ. By his thus instructing them, they were made able to instruct others; as candles are lighted, not to be covered, but to be placed on a candlestick, that they may give light to a room. This parable of the good seed, shows the manner in which the kingdom of God makes progress in the world. Let but the word of Christ have the place it ought to have in a soul, and it will show itself in a good conversation. It grows gradually: first the blade; then the ear; after that the full corn in the ear. When it is sprung up, it will go forward. The work of grace in the soul is, at first, but the day of small things; yet it has mighty products even now, while it is in its growth; but what will there be when it is perfected in heaven!And he said,.... Still continuing his discourse on this subject, and in order to convey to the minds of his disciples clearer ideas of the Gospel dispensation, the success of the Gospel, and the usefulness of their ministration of it, for their encouragement, how unpromising soever things might then be:

whereunto shall we liken the kingdom of God, or with what comparison shall we compare it? It was usual with the Jewish doctors, when about to illustrate anything in a parabolical way to begin with such like questions; as, , "to what is this thing like" (d)? when the answer is to such or such thing, as here.

(d) T. Hieros. Bava Bathra, fol. 16. 2. T. Bab. Zebachim, fol. 82. 1. & Sabbat, fol. 108. 1. & passim.