John 1:15
What then says he? He “bears witness concerning Him, and cries, saying” What means that word “cries”? Boldly, he means, and freely, without any reserve, he proclaims. What does he proclaim? To what does he “bear witness,” and “cry”? “This is He of whom I said, He that comes after me is preferred before me; for He was before me.” The testimony is dark, and contains besides much that is lowly. For he does not say, “This is the Son of God, the Only-begotten, the true Son”; but what? “He that comes after me, is preferred before me; for He was before me.” As the mother birds do not teach their young all at once how to fly, nor finish their teaching in a single day, but at first lead them forth so as to be just outside the nest, then after first allowing them to rest, set them again to flying, and on the next day continue a flight much farther, and so gently, little by little, bring them to the proper height; just so the blessed John did not immediately bring the Jews to high things, but taught them for a while to fly up a little above the earth saying, that Christ was greater than he. And yet this, even this was for the time no small thing, to have been able to persuade the hearers that one who had not yet appeared nor worked any wonders was greater than a man, (John, I mean,) so marvelous, so famous, to whom all ran, and whom they thought to be an angel. For a while therefore he labored to establish this in the minds of his hearers, that He to whom testimony was borne was greater than he who bore it; He that came after, than he that came before, He who had not yet appeared, than he that was manifest and famous. And observe how prudently he introduces his testimony; for he does not only point Him out when He has appeared, but even before He appears, proclaims Him. For the expression, “This is He of whom I spoke,” is the expression of one declaring this. As also Matthew says, that when all came to him, he said, “I indeed baptize you with water, but He that comes after me is mightier than I, the latchet of whose shoes I am not worthy to unloose.” Wherefore then even before His appearance did he this? In order that when He appeared, the testimony might readily be received, the minds of the hearers being already prepossessed by what was said concerning Him, and the mean external appearance not vitiating it. For if without having heard anything at all concerning Him they had seen the Lord, and as they beheld Him had at the same time received the testimony of John's words, so wonderful and great, the meanness of His appearance would have straightway been an objection to the grandeur of the expressions. For Christ took on Him an appearance so mean and ordinary, that even Samaritan women, and harlots, and publicans, had confidence boldly to approach and converse with Him. As therefore, I said, if they had at once heard these words and seen Himself, they might perhaps have mocked at the testimony of John; but now because even before Christ appeared, they had often heard and had been accustomed to what was said concerning Him, they were affected in the opposite way, not rejecting the instruction of the words by reason of the appearance of Him who was witnessed of, but from their belief of what had been already told them, esteeming Him even more glorious.
The phrase, “that comes after,” means, “that” preaches “after me,” not “that” was born “after me.” And this Matthew glances at when he says, “after me comes a man,” not speaking of His birth from Mary, but of His coming to preach (the Gospel), for had he been speaking of the birth, he would not have said, “comes,” but “has come”; since He was born when John spoke this. What then means “is before me”? Is more glorious, more honorable. “Do not,” he says, “because I came preaching first from this, suppose that I am greater than He; I am much inferior, so much inferior that I am not worthy to be counted in the rank of a servant.” This is the sense of “is before me,” which Matthew showing in a different manner, says, “The latchet of whose shoes I am not worthy to unloose.” Again, that the phrase, “is before me,” does not refer to His coming into Being, is plain from the sequel; for had he meant to say this, what follows, “for He was before me,” would be superfluous. For who so dull and foolish as not to know that He who “was born before” him “was before” him? Or if the words refer to His subsistence before the ages, what is said is nothing else than that “He who comes after me came into being before me.” Besides, such a thing as this is unintelligible, and the cause is thrown in needlessly; for he ought to have said the contrary, if he had wished to declare this, “that He who comes after me was before me, since also He was born before me.” For one might with reason assign this, (the “being born before”) as the cause of “being before,” but not the “being before,” as the cause of “being born.” While what we assert is very reasonable. Since you all at least know this, that they are always things uncertain not things evident, that require their causes to be assigned. Now if the argument related to the production of substance, it could not have been uncertain that he who “was born” first must needs “be” first; but because he is speaking concerning honor, he with reason explains what seems to be a difficulty. For many might well enquire, whence and on what pretext He who came after, became before, that is, appeared with great honor; in reply to this question therefore, he immediately assigns the reason; and the reason is, His Being first. He does not say, that “by some kind of advancement he cast me who has been first behind him, and so became before me,” but that “he was before me,” even though he arrives after me.
But how, says one, if the Evangelist refers to His manifestation to men, and to the glory which was to attend Him from them, does he speak of what was not yet accomplished, as having already taken place? For he does not say, “shall be,” but “was.” Because this is a custom among the prophets of old, to speak of the future as of the past. Thus Isaiah speaking of His slaughter does not say, “He shall be led (which would have denoted futurity) as a sheep to the slaughter”; but “He was led as a sheep to the slaughter”; yet He was not yet Incarnate, but the Prophet speaks of what should be as if it had come to pass. So David, pointing to the Crucifixion, said not, “They shall pierce My hands and My feet,” but “They pierced My hands and My feet, and parted My garments among them, and cast lots upon My vesture”; and discoursing of the traitor as yet unborn, he says, “He which did eat of My bread, has lifted up his heel against Me”; and of the circumstances of the Crucifixion, “They gave Me gall for meat, and in My thirst they gave Me vinegar to drink.”
4. Do you desire that we adduce more examples, or do these suffice? For my part, I think they do; for if we have not dug over the ground in all its extent, we have at least dug down to its bottom; and this last kind of work is not less laborious than the former; and we fear lest by straining your attention immoderately we cause you to fall back.
Source: Homilies on the Gospel of John (New Advent)