Matthew 11:15

Then He states also another infallible sign, saying, "If ye 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 ye attend exactly, saith He. For "I will send," saith He, "my messenger before Thy face." And well hath He said, "If ye will receive it," to show the absence of force. For I do not constrain, saith 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 ye 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 hath 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 hath ears to hear, let him hear," He doth just the same thing.

That He says, This is Elias, is figurative, and needs to be explained, as what follows, shews; He that hath ears to hear, let him hear.

As much as to say, Whoso has ears of the heart to hear, that is, to understand, let him understand; for He did not say that John was Elias in person, but in the Spirit.