4 “And from the days of John the Baptist,” says He, “until now, the kingdom of heaven suffers violence, and the violent take it by force.”
And what sort of connection may this have with what was said before? Much, assuredly, and in full accordance therewith. Yea, by this topic also He proceeds to urge and press them into the faith of Himself; and at the same time likewise, He is speaking in agreement with what had been before said by John. For if all things are fulfilled even down to John, I am “He that should come.”
“For all the prophets,” says He, “and the law prophesied until John.”
For the prophets would not have ceased, unless I had come. Expect therefore nothing further, neither wait for any one else. For that I am He is manifest both from the prophets ceasing, and from those that every day “take by force” the faith that is in me. For so manifest is it and certain, that many even take it by force. Why, who has so taken it? Tell me. All who approach it with earnestness of mind.
Then He states also another infallible sign, saying, “If you will receive it, he is Elias, which was for to come.” For “I will send you,” it is said, “Elias the Tishbite, who shall turn the heart of the father to the children.” This man then is Elias, if you attend exactly, says He. For “I will send,” says He, “my messenger before Your face.”
And well has He said, “If you will receive it,” to show the absence of force. For I do not constrain, says He. And this He said, as requiring a candid mind, and showing that John is Elias, and Elias John. For both of them received one ministry, and both of them became forerunners. Wherefore neither did He simply say, “This is Elias,” but, “If you are willing to receive it, this is he,” that is, if with a candid mind ye give heed to what is going on. And He did not stop even at this, but to the words, “This is Elias, which was for to come,” He added, to show that understanding is needed, He that has ears to hear, let him hear.
Now He used so many dark sayings, to stir them up to inquiry. And if not even so were they awakened, much more, had all been plain and clear. For this surely no man could say, that they dared not ask Him, and that He was difficult of approach. For they that were asking him questions, and tempting Him about common matters, and whose mouths were stopped a thousand times, yet they did not withdraw from Him; how should they but have inquired of Him, and besought Him touching the indispensable things, had they indeed been desirous to learn? For if concerning the matters of the law they asked, “Which is the first commandment,” and all such questions, although there was of course no need of His telling them that; how should they but ask the meaning of what He Himself said, for which also He was bound to give account in His answers? And especially when it was He Himself that was encouraging and drawing them on to do this. For by saying, “The violent take it by force,” He stirs them up to earnestness of mind; and by saying, “He that has ears to hear, let him hear,” He does just the same thing.
Source: Homilies on the Gospel of St. Matthew (New Advent)