25 And knew her not till she had brought forth her firstborn son: and he called his name JESUS.
[AD 108] Ignatius of Antioch on Matthew 1:18-25
For what reason did God, deciding that the Savior should be born from a virgin, not choose a virgin who was not betrothed? Might it have been, then, an economy for her to conceive while having a betrothed, so that it might not appear as a disgrace upon her body for her to conceive? For it is rightly written in one of the letters of a certain martyr—I mean Ignatius, the second bishop of Antioch after the blessed Peter, who fought with beasts in Rome during the persecution—“and the virginity of Mary escaped the notice of the ruler of this age.” So, if it had not been for what seemed to be a marriage, it would not have escaped his notice, but the ruler of this age would have known that Mary, having never slept with a man, conceived, and thus the conception must be divine. The Savior wished through the entire economy to elude the devil, and indeed ordered the disciples not to make him manifest.

[AD 253] Origen of Alexandria on Matthew 1:18-25
For what reason did God, deciding that the Savior should be born from a virgin, not choose a virgin who was not betrothed? Might it have been, then, an economy for her to conceive while having a betrothed, so that it might not appear as a disgrace upon her body for her to conceive? For it is rightly written in one of the letters of a certain martyr—I mean Ignatius, the second bishop of Antioch after the blessed Peter, who fought with beasts in Rome during the persecution—“and the virginity of Mary escaped the notice of the ruler of this age.” So, if it had not been for what seemed to be a marriage, it would not have escaped his notice, but the ruler of this age would have known that Mary, having never slept with a man, conceived, and thus the conception must be divine. The Savior wished through the entire economy to elude the devil, and indeed ordered the disciples not to make him manifest. But even when he was tempted by the devil, nowhere did he openly declare that he is the Son of God, but merely said: it is not necessary for me to worship you, it is not necessary for me to make stones into bread, it is not necessary for me to throw myself down from above. Also, the Apostle says that the economy of the passion was done in forgetfulness of the opposing power: “which none of the rulers of this age understood; for if they had, they would not have crucified the Lord of glory.” If it was not hidden from the demon—for it said: “We know who you are, the Son of God”—see, the lesser in evil knew the Savior, but the greater in evil was hindered by the magnitude of his wickedness from beholding him.

[AD 1546] Martin Luther on Matthew 1:18-25
Now this refutes also the false interpretation which some have drawn from the words of Matthew, where he says, "Before they came together she was found to be with child." They interpret this as though the evangelist meant to say, "Later she came together with Joseph like any other wife and lay with him, but before this occurred she was with child apart from Joseph," etc. Again, when he says, "And Joseph knew her not until she brought forth her first-born son" [Matt. 1:25], they interpret it as though the evangelist meant to say that he knew her, but not before she had brought forth her first-born son. This was the view of Helvidius which was refuted by Jerome.

Such carnal interpretations miss the meaning and purpose of the evangelist. As we have said, the evangelist, like the prophet Isaiah, wishes to set before our eyes this mighty wonder, and point out what an unheard-of thing it is for a maiden to be with child before her husband brings her home and lies with her; and further, that he does not know her carnally until she first has a son, which she should have had after first having been known by him. Thus, the words of the evangelist do not refer to anything that occurred after the birth, but only to what took place before it. For the prophet and the evangelist, and St. Paul as well, do not treat of this virgin beyond the point where they have from her that fruit for whose sake she is a virgin and everything else. After the child is born they dismiss the mother and speak not about her, what became of her, but only about her offspring. Therefore, one cannot from these words [Matt. 1:18, 25] conclude that Mary, after the birth of Christ, became a wife in the usual sense; it is therefore neither to be asserted nor believed. All the words are merely indicative of the marvelous fact that she was with child and gave birth before she had lain with a man.

The form of expression used by Matthew is the common idiom, as if I were to say, "Pharaoh believed not Moses, until he was drowned in the Red Sea." Here it does not follow that Pharaoh believed later, after he had drowned; on the contrary, it means that he never did believe. Similarly when Matthew [1:25] says that Joseph did not know Mary carnally until she had brought forth her son, it does not follow that he knew her subsequently; on the contrary, it means that he never did know her. Again, the Red Sea overwhelmed Pharaoh before he got across. Here too it does not follow that Pharaoh got across later, after the Red Sea had overwhelmed him, but rather that he did not get across at all. In like manner, when Matthew [1:18] says, "She was found to be with child before they came together," it does not follow that Mary subsequently lay with Joseph, but rather that she did not lie with him.

Elsewhere in Scripture the same manner of speech is employed. Psalm 110 [:1] reads, "God says to my Lord: 'Sit at my right hand, till I make your enemies your footstool.'" Here it does not follow that Christ does not continue to sit there after his enemies are placed beneath his feet. Again, in Genesis 28 [:15], "I will not leave you until I have done all that of which I have spoken to you." Here God did not leave him after the fulfillment had taken place. Again, in Isaiah 42 [:4], "He shall not be sad, nor troublesome, till he has established justice in the earth." There are many more similar expression, so that this babble of Helvidius is without justification; in addition, he has neither noticed nor paid any attention to either Scripture or the common idiom.

[AD 1963] CS Lewis on Matthew 1:18-25
There is an activity of God displayed throughout creation, a wholesale activity let us say which men refuse to recognize. The miracles done by God incarnate, living as a man in Palestine, perform the very same things as this wholesale activity, but at a different speed and on a smaller scale. One of their chief purposes is that men, having seen a thing done by personal power on the small scale, may recognize, when they see the same thing done on the large scale, that the power behind it is also personal – is indeed the very same person who lived among us two thousand years ago. The miracles in fact are a retelling in small letters of the very same story which is written across the whole world in letters too large for some of us to see...

I can understand the man who denies the miraculous altogether; but what is one to make of the people who admit some miracles but deny the Virgin Birth? Is it that for all their lip service to the laws of Nature there is only one law of Nature that they really believe? Or is it that they see in this miracle a slur upon sexual intercourse which is rapidly becoming the one thing venerated in a world without veneration? No miracle is in fact more significant. What happens in ordinary generation? What is a father’s function in the act of begetting? A microscopic particle of matter from his body fertilizes the female: and with that microscopic particle passes, it may be, the color of his hair and his great grandfather’s hanging lip, and the human form in all its complexity of bones, liver, sinews, heart, and limbs, and pre-human form which the embryo will recapitulate in the womb. Behind every spermatozoon lies the whole history of the universe: locked within it is no small part of the world’s future. That is God’s normal way of making a man – a process that takes centuries, beginning with the creation of matter itself, and narrowing to one second and one particle at the moment of begetting. And once again men will mistake the sense impressions which this creative act throws off for the act itself or else refer it to some infinite being such as Genius. Once, therefore, God does it directly, instantaneously; without a spermatozoon, without the millenniums of organic history behind the spermatozoon. There was of course another reason. This time He was creating not simply a man, but the man who was to be Himself: the only true Man. The process which leads to the spermatozoon has carried down with it through the centuries much undesirable silt; the life which reaches us by that normal route is tainted. To avoid that taint, to give humanity a fresh start, he once short-circuited the process. There is a vulgar anti-God paper which some anonymous donor sends me every week. In it recently I saw the taunt that we Christians believe in a God who committed adultery with the wife of a Jewish carpenter. The answer to that is that if you describe the action of God in fertilizing Mary as “adultery” then, in that sense, God would have committed adultery with every woman who ever had a baby. For what He did once without a human father, He does always even when He uses a human father as His instrument. For the human father in ordinary generation is only a carrier, sometimes an unwilling carrier, always the last in a long line of carriers, of life that comes from the supreme life. Thus the filth that our poor, muddled, sincere, resentful enemies fling at the Holy One, either does not stick, or, sticking, turns into glory.


[AD 383] Jerome on Matthew 1:24-25
The passage for discussion now is, "And Joseph arose from his sleep, and did as the angel of the Lord commanded him, and took unto him his wife and knew her not till she had brought forth a son, and he called his name Jesus." Here, first of all, it is quite needless for our opponent to show so elaborately that the word know has reference to coition, rather than to intellectual apprehension: as though anyone denied it, or any person in his senses could ever imagine the folly which Helvidius takes pains to refute. Then he would teach us that the adverb till implies a fixed and definite time, and when that is fulfilled, he says the event takes place which previously did not take place, as in the case before us, "and knew her not till she had brought forth a son." It is clear, says he, that she was known after she brought forth, and that that knowledge was only delayed by her engendering a son. To defend his position he piles up text upon text, waves his sword like a blind-folded gladiator, rattles his noisy tongue, and ends with wounding no one but himself.

Our reply is briefly this — the words knew and till in the language of Holy Scripture are capable of a double meaning. As to the former, he himself gave us a dissertation to show that it must be referred to sexual intercourse, and no one doubts that it is often used of the knowledge of the understanding, as, for instance, "the boy Jesus tarried behind in Jerusalem, and his parents knew it not." Now we have to prove that just as in the one case he has followed the usage of Scripture, so with regard to the word till he is utterly refuted by the authority of the same Scripture, which often denotes by its use a fixed time (he himself told us so), frequently time without limitation, as when God by the mouth of the prophet says to certain persons, [Isaiah 46:4] "Even to old age I am he." Will He cease to be God when they have grown old? And the Saviour in the Gospel tells the Apostles, [Matthew 28:20] "Lo, I am with you always, even unto the end of the world." Will the Lord then after the end of the world has come forsake His disciples, and at the very time when seated on twelve thrones they are to judge the twelve tribes of Israel will they be bereft of the company of their Lord? Again Paul the Apostle writing to the Corinthians says, "Christ the first-fruits, afterward they that are Christ's, at his coming. Then comes the end, when he shall have delivered up the kingdom to God, even the Father, when he shall have put down all rule, and all authority and power. For he must reign, till he has put all enemies under his feet." Granted that the passage relates to our Lord's human nature, we do not deny that the words are spoken of Him who endured the cross and is commanded to sit afterwards on the right hand. What does he mean then by saying, "for he must reign, till he has put all enemies under his feet"? Is the Lord to reign only until His enemies begin to be under His feet, and once they are under His feet will He cease to reign? Of course His reign will then commence in its fullness when His enemies begin to be under His feet. David also in the fourth Song of Ascents speaks thus, "Behold, as the eyes of servants look unto the hand of their master, as the eyes of a maiden unto the hand of her mistress, so our eyes look unto the Lord our God, until he have mercy upon us." Will the prophet, then, look unto the Lord until he obtain mercy, and when mercy is obtained will he turn his eyes down to the ground? Although elsewhere he says, "My eyes fail for your salvation, and for the word of your righteousness." I could accumulate countless instances of this usage, and cover the verbosity of our assailant with a cloud of proofs; I shall, however, add only a few, and leave the reader to discover like ones for himself.

The word of God says in Genesis, "And they gave unto Jacob all the strange gods which were in their hand, and the rings which were in their ears; and Jacob hid them under the oak which was by Shechem, and lost them until this day." Likewise at the end of Deuteronomy, [Deuteronomy 34:5-6] "So Moses the servant of the Lord died there in the land of Moab, according to the word of the Lord. And he buried him in the valley, in the land of Moab over against Beth-peor: but no man knows of his sepulchre unto this day." We must certainly understand by this day the time of the composition of the history, whether you prefer the view that Moses was the author of the Pentateuch or that Ezra re-edited it. In either case I make no objection. The question now is whether the words unto this day are to be referred to the time of publishing or writing the books, and if so it is for him to show, now that so many years have rolled away since that day, that either the idols hidden beneath the oak have been found, or the grave of Moses discovered; for he obstinately maintains that what does not happen so long as the point of time indicated by until and unto has not been attained, begins to be when that point has been reached. He would do well to pay heed to the idiom of Holy Scripture, and understand with us, (it was here he stuck in the mud) that some things which might seem ambiguous if not expressed are plainly intimated, while others are left to the exercise of our intellect. For if, while the event was still fresh in memory and men were living who had seen Moses, it was possible for his grave to be unknown, much more may this be the case after the lapse of so many ages. And in the same way must we interpret what we are told concerning Joseph. The Evangelist pointed out a circumstance which might have given rise to some scandal, namely, that Mary was not known by her husband until she was delivered, and he did so that we might be the more certain that she from whom Joseph refrained while there was room to doubt the import of the vision was not known after her delivery.

In short, what I want to know is why Joseph refrained until the day of her delivery? Helvidius will of course reply, because he heard the angel say, [Matthew 1:20] "that which is conceived in her is of the Holy Ghost." And in turn we rejoin that he had certainly heard him say, [Matthew 1:20] "Joseph, thou son of David, fear not to take unto you Mary your wife." The reason why he was forbidden to forsake his wife was that he might not think her an adulteress. Is it true then, that he was ordered not to have intercourse with his wife? Is it not plain that the warning was given him that he might not be separated from her? And could the just man dare, he says, to think of approaching her, when he heard that the Son of God was in her womb? Excellent! We are to believe then that the same man who gave so much credit to a dream that he did not dare to touch his wife, yet afterwards, when he had learned from the shepherds that the angel of the Lord had come from heaven and said to them, "Be not afraid: for behold I bring you good tidings of great joy which shall be to all people, for there is born to you this day in the city of David a Saviour, which is Christ the Lord;" and when the heavenly host had joined with him in the chorus [Luke 2:14] "Glory to God in the highest, and on earth peace among men of good will;" and when he had seen just Simeon embrace the infant and exclaim, "Now let your servant depart, O Lord, according to your word in peace: for my eyes have seen your salvation;" and when he had seen Anna the prophetess, the Magi, the Star, Herod, the angels; Helvidius, I say, would have us believe that Joseph, though well acquainted with such surprising wonders, dared to touch the temple of God, the abode of the Holy Ghost, the mother of his Lord? Mary at all events "kept all these sayings in her heart." You cannot for shame say Joseph did not know of them, for Luke tells us, [Luke 2:33] "His father and mother were marvelling at the things which were spoken concerning Him." And yet you with marvellous effrontery contend that the reading of the Greek manuscripts is corrupt, although it is that which nearly all the Greek writers have left us in their books, and not only so, but several of the Latin writers have taken the words the same way. Nor need we now consider the variations in the copies, since the whole record both of the Old and New Testament has since that time been translated into Latin, and we must believe that the water of the fountain flows purer than that of the stream.

Helvidius will answer, "What you say, is in my opinion mere trifling. Your arguments are so much waste of time, and the discussion shows more subtlety than truth. Why could not Scripture say, as it said of Thamar and Judah, [Genesis 38:26] 'And he took his wife, and knew her again no more'? Could not Matthew find words to express his meaning? 'He knew her not,' he says, 'until she brought forth a son.' He did then, after her delivery, know her, whom he had refrained from knowing until she was delivered."

If you are so contentious, your own thoughts shall now prove your master. You must not allow any time to intervene between delivery and intercourse. You must not say, "If a woman conceive seed and bear a man child, then she shall be unclean seven days; as in the days of the separation of her sickness shall she be unclean. And in the eighth day the flesh of his foreskin shall be circumcised. And she shall continue in the blood of her purifying three and thirty days. She shall touch no hallowed thing," and so forth. On your showing, Joseph must at once approach, her, and be subject to Jeremiah's [Jeremiah 5:8] reproof, "They were as mad horses in respect of women: every one neighed after his neighbour's wife." Otherwise, how can the words stand good, "he knew her not, till she had brought forth a son," if he waits after the time of another purifying has expired, if his lust must brook another long delay of forty days? The mother must go unpurged from her child-bed taint, and the wailing infant be attended to by the midwives, while the husband clasps his exhausted wife. Thus forsooth must their married life begin so that the Evangelist may not be convicted of falsehood. But God forbid that we should think thus of the Saviour's mother and of a just man. No midwife assisted at His birth; no women's officiousness intervened. With her own hands she wrapped Him in the swaddling clothes, herself both mother and midwife, [Luke 2:7] "and laid Him," we are told, "in a manger, because there was no room for them in the inn"; a statement which, on the one hand, refutes the ravings of the apocryphal accounts, for Mary herself wrapped Him in the swaddling clothes, and on the other makes the voluptuous notion of Helvidius impossible, since there was no place suitable for married intercourse in the inn.

[AD 420] Jerome on Matthew 1:24-25
(Cont. Helvid. c. 5.) Helvidius is at much superfluous trouble to make this word know refer to carnal knowledge rather than to acquaintance, as though any had ever denied that; or as if the follies to which he replies had ever occurred to any person of common understanding. He then goes on to say, that the adverb 'until' denotes a fixed time when that should take place, which had not taken place before; so that here from the words, He knew her not until she had brought forth her first-born Son, it is clear, he says, that after that he did know her. And in proof of this he heaps together many instances from Scripture. To all this we answer, that the word 'until' is to be understood in two senses in Scripture. And concerning the expression, knew her not, he has himself shown, that it must be referred to carnal knowledge, none doubting that it is often used of acquaintance, as in that, The child Jesus tarried behind in Jerusalem, and His parents knew not of it. (Luke 2:43.) In like manner 'until' often denotes in Scripture, as he has shown, a fixed period, but often also an infinite time, as in that, Even to your old age I am He. (Isa. 46:4.) Will God then cease to be when they are grown old? Also the Saviour in the Gospel, Lo, I am with you always, even to the end of this world. (Mat. 28:20.) Will He then leave His disciples at the end of the world? Again, the Apostle says, He must reign till He has put His enemies under His feel. (1 Cor. 15:25.) Be it understood then, that that which if it had not been written might have been doubted of, is expressly declared to us; other things are left to our own understandingc. So here the Evangelist informs us, in that wherein there might have been room for error, that she was not known by her husband until the birth of her Son, that we might thence infer that much less was she known afterwards.

(cont. Helvid. 8.) Lastly, I would ask, Why then did Joseph abstain at all up to the day of birth? He will surely answer, Because of the Angel's words, That which is born in her, &c. He then who gave so much heed to a vision as not to dare to touch his wife, would he, after he had heard the shepherds, seen the Magi, and known so many miracles, dare to approach the temple of God, the seat of the Holy Ghost, the Mother of his Lord?

From the words, her firstborn Son, some most erroneously suspect that Mary had other sons, saying that first-born can only be said of one that has brethren. But this is the manner of Scripture, to call the first-born not only one who is followed by brethren, but the first-birth of the mother.

(Cont. Helvid. 10.) For if he only was first-born who was followed by other brethren, then no first-birth could be due to the Priests, till such time as the second birth took place.

[AD 533] Remigius of Rheims on Matthew 1:24-25
Life returned by the same entrance through which death had entered in. By Adam's disobedience we were ruined, by Joseph's obedience we all begin to be recalled to our former condition; for in these words is commended to us the great virtue of obedience, when it is said, And Joseph rising from sleep, did as the Angel of the Lord had commanded him.

Or, Took her so far, as that the nuptial rites being complete, she was called his wife; but not so far as to lie with her, as it follows, And knew her not.

It is clear that this Name was well known to the Holy Fathers and the Prophets of God, but to him above all, who spake, My soul fainted for Thy salvation; (Ps. 119:81.) and, My soul hath rejoiced in Thy salvation. Also to him who spake, I will joy in God my Saviour. (Ps. 13:5. Hab. 3:18.)

[AD 1274] Pseudo-Chrysostom on Matthew 1:24-25
Took unto him, not took home to him; for he had not sent her away; he had put her away in thought only, and now took her again in thought.

As one might say, 'He told it not so long as he lived;' would this imply that he told it after his death? Impossible. So it were credible that Joseph might have known her before the birth, while he was yet ignorant of the great mystery; but after that he understood how she had been made a temple of the Only-begotten of God, how could he occupy that? The followers of Eunomius think, as they have dared to assert this, that Joseph also dared to do it, just as the insane think all men equally mad with themselves.

It may be said, that know here signifies simply, to understand; that whereas before he had not understood how great her dignity, after the birth he then knew that she had been made more honourable and worthy than the whole world, who had carried in her womb Him whom the whole world could not contain.

[AD 1274] Glossa Ordinaria on Matthew 1:24-25
(ap. Anselm.) This error then is barred by the Evangelist saying, That it might be fulfilled which was spoken of the Lord by the Prophet. Now one kind of prophecy is by the preordination of God, and must needs be fulfilled, and that without any free choice on our part. Such is that of which we now speak; wherefore he says, Lo, to show the certainty of prophecy. There is another kind of prophecy which is by the foreknowledge of God, and with this our free will is mixed up; wherein by grace working with us we obtain reward, or if justly deserted by it, torment. Another is not of foreknowledge, but is a kind of threat made after the manner of men; as that, Yet forty days, and Nineveh shall be overthrown: (Jonah 3.) understanding, unless the Ninevites amend themselves.

(ord. et ap. Anselm ex Beda cit.) He not only did what the Angel commanded, but as he commanded it. Let each one who is warned of God, in like manner, break off all delays, rise from sleep, and do that which is commanded him.

Otherwise; On account of the glorification of the most holy Mary, she could not be known by Joseph until the birth; for she who had the Lord of glory in her womb, how should she be known? If the face of Moses talking with God was made glorious, so that the children of Israel could not look thereon, how much more could not Mary be known, or even looked upon, who bare the Lord of glory in her womb? After the birth she was known of Joseph to the beholding of her face, but not to be approached carnally.

(Ord.) Or; He is first-born among the elect by grace; but by nature the Only-begotten of God the Father, the only Son of Mary. And called His name Jesus, on the eighth day on which the circumcision took place, and the Name was given.

[AD 373] Ephrem the Syrian on Matthew 1:25
Because there are those who dare to say that Mary cohabited with Joseph after she bore the Redeemer, we reply, 'How would it have been possible for her who was the home of the indwelling of the Spirit, whom the divine power overshadowed, that she be joined by a mortal being, and gave birth filled with birthpangs, in the image of the primeval curse?' If Mary was blessed of women, she would have been exempt from the curse from the beginning, and from the bearing of children in birthpangs and curses. It would be impossible therefore to call one who gave birth with these birthpangs blessed.

[AD 379] Basil of Caesarea on Matthew 1:25
For "he did not know her" - it says - "until she gave birth to a Son, her firstborn." But this could make one suppose that Mary, after having offered in all her purity her own service in giving birth to the Lord, by virtue of the Holy Spirit, did not subsequently refrain from normal conjugal relations. That would not have affected the teaching of our religion at all, because Mary's virginity was necessary until the service of the Incarnation, and what happened afterward need not be investigated in order to affect the doctrine of the mystery. But since the lovers of Christ [that is, the faithful] do not allow themselves to hear that the Mother of God ceased at a given moment to be a virgin, we consider their testimony sufficient.

[AD 398] Didymus the Blind on Matthew 1:25
It helps us to understand the terms 'first-born' and 'only-begotten' when the Evangelist tells that Mary remained a virgin 'until she brought forth her first-born son' [Matt. 1:25]; for neither did Mary, who is to be honored and praised above all others, marry anyone else, nor did she ever become the Mother of anyone else, but even after childbirth she remained always and forever an immaculate virgin

[AD 403] Epiphanius of Salamis on Matthew 1:25
For I have heard from someone that certain persons are venturing to say that she had marital relations after the Savior's birth. And I am not surprised. The ignorance of persons who do not know the sacred scriptures well and have not consulted histories, always turns them to one thing after another, and distracts anyone who wants to track down something about the truth out of his own head. To begin with, when the Virgin was entrusted to Joseph - lots having compelled her to take this step - she was not entrusted to him for marriage, since he was a widower. He was called her husband because of the Law, but it plainly follows from the Jewish tradition that the Virgin was not entrusted to him for matrimony. It was for the preservation of her virginity in witness to the things to come - [a witness] that Christ's incarnation was nothing spurious but was truly attested, as without a man's seed but truly brought about by the Holy Spirit.

[AD 406] Chromatius of Aquileia on Matthew 1:25
But concerning what the Evangelist said, "And he did not know her till she had borne her firstborn son," not a few careless people insist on asking whether after the Lord’s birth the holy mother Mary had relations with Joseph. But this is not admissible on the grounds of either faith or truth. Far be it indeed that after the sacrament of so great a mystery and after the birth of the sublime Lord, one should believe that the Virgin Mary was intimate with a man. Remember that Miriam the prophetess of the Old Testament (the sister of Moses and Aaron) remained a virgin unsullied by man, having beheld the light of heavenly signs after the plagues of Egypt and the parting of the Red Sea and the Lord’s glory going in advance and seen in a pillar of fire and clouds. It is not plausible therefore that the Mary of the Gospel, a virgin bearing God, who beheld God’s glory not in a cloud but was worthy of carrying him in her virginal womb, had relations with a man. Noah, who was made worthy to converse with God, declared that he would abstain from the conjugal need. Moses, after hearing God calling him from the bush, abstained from conjugal relations. Now are we to believe that Joseph, the man who always did what was right, had relations with holy Mary after the birth of the Lord?

[AD 407] John Chrysostom on Matthew 1:25
And when he had taken her, "he knew her not, till she had brought forth her first-born Son." He has here used the word "till," not that you should suspect that afterwards he did know her, but to inform you that before the birth the Virgin was wholly untouched by man. But why then, it may be said, has he used the word, "till"? Because it is usual in Scripture often to do this, and to use this expression without reference to limited times. For so with respect to the ark likewise, it is said, "The raven returned not till the earth was dried up." [Genesis 8:7] And yet it did not return even after that time. And when discoursing also of God, the Scripture says, "From age until age You are," not as fixing limits in this case. And again when it is preaching the Gospel beforehand, and saying, "In his days shall righteousness flourish, and abundance of peace, till the moon be taken away," it does not set a limit to this fair part of creation. So then here likewise, it uses the word "till," to make certain what was before the birth, but as to what follows, it leaves you to make the inference. Thus, what it was necessary for you to learn of Him, this He Himself has said; that the Virgin was untouched by man until the birth; but that which both was seen to be a consequence of the former statement, and was acknowledged, this in its turn he leaves for you to perceive; namely, that not even after this, she having so become a mother, and having been counted worthy of a new sort of travail, and a child-bearing so strange, could that righteous man ever have endured to know her. For if he had known her, and had kept her in the place of a wife, how is it that our Lord [John 19:27] commits her, as unprotected, and having no one, to His disciple, and commands him to take her to his own home?

How then, one may say, are James and the others called His brethren? In the same kind of way as Joseph himself was supposed to be husband of Mary. For many were the veils provided, that the birth, being such as it was, might be for a time screened. Wherefore even John so called them, saying, "For neither did His brethren believe in Him."

[AD 420] Jerome on Matthew 1:25
(Verse 25.) And he took his wife, and did not know her until she had brought forth her firstborn son: and he called his name Jesus. From this passage, some very perverse people suspect and say that Mary had other children, arguing that the term firstborn is only used when someone has siblings. However, this is contrary to the custom in the divine scriptures, where the term firstborn is not applied to someone who has siblings, but to the one who is born first. Read the aforementioned book against Helvidius.

[AD 430] Augustine of Hippo on Matthew 1:25
Those heretics were called Antidicomarites who denied the virginity of Mary to the point that they claim that after the birth of Christ she had intercourse with her husband.

[AD 430] Augustine of Hippo on Matthew 1:25
It was not the visible sun, but its invisible Creator who consecrated this day for us, when the Virgin Mother, fertile of womb and integral in her virginity, brought him forth, made visible for us, by whom, when he was invisible, she too was created. A Virgin conceiving, a Virgin bearing, a Virgin pregnant, a Virgin bringing forth, a Virgin perpetual. Why do you wonder at this, O man?

[AD 450] Peter Chrysologus on Matthew 1:25
Where are they who think that the Virgin's conception and giving birth to her child are to be likened to those of other women... The Virgin conceives, the Virgin brings forth her child, and she remains a virgin.

[AD 461] Leo the Great on Matthew 1:25
And by a new nativity He was begotten, conceived by a Virgin, born of a Virgin, without paternal desire, without injury to the mother's chastity... for a Virgin conceived, a Virgin bare, and a Virgin she remained.

[AD 553] Second Council of Constantinople on Matthew 1:25
If anyone shall not confess that the Word of God has two nativities, the one from all eternity of the Father, without time and without body; the other in these last days, coming down from heaven and being made flesh of the holy and glorious Mary, Mother of God and always a virgin, and born of her: let him be anathema.

[AD 649] Lateran Council of 649 on Matthew 1:25
If anyone does not in accord with the Holy Fathers acknowledge the holy and ever virgin and immaculate Mary was really and truly the Mother of God, inasmuch as she, in the fullness of time, and without seed, conceived by the Holy Spirit, God in the Word Himself, who before all time was born of God the Father, and without loss of integrity brought Him forth, and after His birth preserved her virginity inviolate, let him be condemned.

[AD 749] John Damascene on Matthew 1:25
But just as He who was conceived kept her who conceived still virgin, in like manner also He who was born preserved her virginity intact, only passing through her and keeping her closed. [Ezekiel 44:2] The conception, indeed, was through the sense of hearing, but the birth through the usual path by which children come, although some tell tales of His birth through the side of the Mother of God. For it was not impossible for Him to have come by this gate, without injuring her seal in anyway.

The ever-virgin One thus remains even after the birth still virgin, having never at any time up till death consorted with a man. For although it is written, And knew her not till she had brought forth her first-born Son [Matthew 1:25], yet note that he who is first-begotten is first-born even if he is only-begotten. For the word "first-born" means that he was born first but does not at all suggest the birth of others. And the word "till" signifies the limit of the appointed time but does not exclude the time thereafter. For the Lord says, And lo, I am with you always, even unto the end of the world , not meaning thereby that He will be separated from us after the completion of the age. The divine apostle, indeed, says, And so shall we ever be with the Lord [1 Thessalonians 4:17], meaning after the general resurrection.

For could it be possible that she, who had borne God and from experience of the subsequent events had come to know the miracle, should receive the embrace of a man. God forbid!

[AD 1107] Theophylact of Ohrid on Matthew 1:25
That is, he never came together with her at all. "Until" here does not mean that before the birth he did not know her and afterwards he did, but that he absolutely never knew her. Scripture employs this expression. For example, the raven "returned not unto the ark until the water had dried off from the earth" (Gen 8:7). But neither did it return after the water had dried off. Again, "I am with you until the end of the world" (Gen 28:20). So after the end He will no longer be with the saints? But how can that be? For at that time more than ever will He be with them. So must you understand here "until she brought forth’’ to mean, neither before the birth nor after the birth did he know her. How could he have touched the Holy Virgin having once understood the ineffable birth giving?

The evangelist does not call Him "her firstborn son" in the sense that she later gave birth to a second son, but simply that He was the first and only child that she bore. For Christ is both the "firstborn" by having been born first, and the "only begotten," in that He had no brother.

And here, too, he shows Joseph’s ready obedience to do everything that the angel had told him to do.

[AD 1274] Thomas Aquinas on Matthew 1:25
Some have said that this is not to be understood of carnal knowledge, but of acquaintance. Thus Chrysostom says [Opus Imperf. in Matth., Hom. 1: among the spurious works ascribed to Chrysostom] that "Joseph did not know her, until she gave birth, being unaware of her dignity: but after she had given birth, then did he know her. Because by reason of her child she surpassed the whole world in beauty and dignity: since she alone in the narrow abode of her womb received Him Whom the world cannot contain."

Others again refer this to knowledge by sight. For as, while Moses was speaking with God, his face was so bright "that the children of Israel could not steadfastly behold it"; so Mary, while being "overshadowed" by the brightness of the "power of the Most High," could not be gazed on by Joseph, until she gave birth. But afterwards she is acknowledged by Joseph, by looking on her face, not by lustful contact.

Jerome, however, grants that this is to be understood of knowledge by intercourse; but he observes that "before" or "until" has a twofold sense in Scripture. For sometimes it indicates a fixed time, as Galatians 3:19: The law "was set because of transgressions, until the seed should come, to whom He made the promise." On the other hand, it sometimes indicates an indefinite time, as in Psalm 122:2: "Our eyes are unto the Lord our God, until He have mercy on us"; from which it is not to be gathered that our eyes are turned from God as soon as His mercy has been obtained. In this sense those things are indicated "of which we might doubt if they had not been written down: while others are left out to be supplied by our understanding. Thus the evangelist says that the Mother of God was not known by her husband until she gave birth, that we may be given to understand that still less did he know her afterwards" (Adversus Helvid. v).

[AD 1531] Ulrich Zwingli on Matthew 1:25
I have never thought, still less taught, or declared publicly, anything concerning the subject of the ever Virgin Mary, Mother of our salvation, which could be considered dishonorable, impious, unworthy or evil... I believe with all my heart according to the word of holy gospel that this pure virgin bore for us the Son of God and that she remained, in the birth and after it, a pure and unsullied virgin, for eternity.

[AD 1564] John Calvin on Matthew 1:25
And knew her not. This passage afforded the pretext for great disturbances, which were introduced into the Church, at a former period, by Helvidius. The inference he drew from it was, that Mary remained a virgin no longer than till her first birth, and that afterwards she had other children by her husband. Jerome, on the other hand, earnestly and copiously defended Mary's perpetual virginity. Let us rest satisfied with this, that no just and well-grounded inference can be drawn from these words of the Evangelist, as to what took place after the birth of Christ. He is called first-born; but it is for the sole purpose of informing us that he was born of a virgin. It is said that Joseph knew her not till she had brought forth her first-born son: but this is limited to that very time. What took place afterwards, the historian does not inform us. Such is well known to have been the practice of inspired writers. Certainly, no man will ever raise a question on this subject, except from curiosity; and no man will obstinately keep up the argument, except from an extreme fondness for disputation.

[AD 1564] John Calvin on Matthew 1:25
There have been certain folk who have wished to suggest that from this passage (Matt 1:25) that the Virgin Mary had other children than the Son of God, and that Joseph then dwelt with her later; but what folly this is! For the gospel writer did not wish to record what happened afterwards; he simply wished to make clear Joseph's obedience and to show also that Joseph had been well and truly assured that it was God who had sent His angel to Mary. He had therefore never dwelt with her nor had he shared her company... And besides this Our Lord Jesus Christ is called the first-born. This is not because there was a second or a third, but because the gospel writer is paying regard to the precedence. Scripture speaks thus of naming the first-born whether or not there was any question of the second. Thus we see the intention of the Holy Spirit. This is why to lend ourselves to foolish subtleties would be to abuse Holy Scripture.

[AD 1749] John Wesley on Matthew 1:25
I believe that He [Jesus] was made man, joining the human nature with the divine in one person; being conceived by the singular operation of the Holy Ghost, and born of the blessed Virgin Mary, who, as well after as before she brought Him forth, continued a pure and unspotted virgin.

[AD 1889] JB Lightfoot on Matthew 1:25
Certain expressions in the evangelical narratives are said to imply that Mary bore other children besides the Lord, and it is even asserted that no unprejudiced person could interpret them otherwise. The justice of this charge may be fairly questioned. The context in each case seems to suggest another explanation of these expressions, which does not decide anything one way or the other. St. Matthew writes that Joseph ‘knew not’ his wife ‘till (ewV ou) she brought forth a son’ (1:25); while St. Luke speaks of her bringing forth ‘her firstborn son’ (2:7). St. Matthew’s expression however, ‘till she brought forth,’ as appears from the context, is intended simply to show that Jesus was not begotten in the course of nature; and thus, while it denies any previous intercourse with her husband, it neither asserts nor implies any subsequent intercourse. Again, the prominent idea conveyed by the term ‘firstborn’ to a Jew would be not the birth of other children, but the special consecration of this one. The typical reference in fact is foremost in the mind of St. Luke, as he himself explains it, ‘Every male that openeth the womb shall be called holy to the Lord’ (2:23). Thus ‘firstborn’ does not necessarily suggest ‘later-born,’ any more than ‘son’ suggests ‘daughter.’ The two words together describe the condition under which in obedience to the law a child was consecrated to God. The ‘firstborn son’ is in fact the Evangelist’s equivalent for the ‘male that openeth the womb.’