Mateus 1
Origen of Alexandria · Comentário Patrístico (catena)
Mateus 1:18
[(as quoted by Aquinas, AD 1274)] (non occ.) She was indeed espoused to Joseph, but not united in wedlock; that is to say, His mother immaculate, His mother incorrupt, His mother pure. His mother! Whose mother? The mother of God, of the Only-begotten, of the Lord, of the King, of the Maker of all things, and the Redeemer of all. — Catena Aurea by Aquinas
Mateus 1:18
Why does the Evangelist make mention here of "birth," whereas at the start of the Gospel he had said "generation"? For in this place he says, "Now the birth of Jesus Christ took place in this way," but there "The book of the generation." … What then is the difference between "birth" and "generation"? How are either of them to be understood as applied to Christ? Note that this, my spoken word, in its own proper nature, is intangible and invisible. But when it is written down in a book, in a manner of speaking, it takes on a body. It is then both seen and touched. So it is with the fleshless, bodiless Word of God. The Word is neither seen nor described according to his Godhood but becomes, through his incarnation, subject to both sight and description. For this reason there is the "book" of his "generation" as of one who is made flesh. But here the point under investigation is not why he says "book" instead of "vision" or "account" (for this has been discussed already). Rather, it is why, when Matthew had previously mentioned "generation," he here speaks of "birth." What is "birth" as distinguished from "generation"? There is a difference between generation and birth. For "generation," or "coming into being," is the original formation of things by God, while "birth" is the succession from others caused by the verdict of death that came on account of the transgression. And even now, "generation" has something incorruptible and sinless about it, whereas "birth" implies that which is subject to passion and sin. The Lord in his eternal generation is incapable of sin. His being born did not undermine his eternal generation, which is incorruptible. But upon being born he assumed what is passible. That does not imply that he assumed what is subject to sin. He continued to bear the original Adam incapable of being lessened, either in respect of corruptibility or as regards the possibility of sin. Hence the "generation" in the case of Christ is not according to some procession from nonbeing into being. It is rather a transition [a path, a way] from existing "in the form of God" to the taking on of "the form of a servant." Hence his "birth" was both like ours and above ours. For to be born "of woman" is like our birth, but to be born "not of the will of the flesh" or "of man" but of the Holy Spirit is above ours. There is here an intimation, a prior announcement of a future birth to be bestowed on us by the Spirit. — FRAGMENT 11.7
Mateus 1:18
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. — Homilies on Luke
Mateus 1:19
[(as quoted by Aquinas, AD 1274)] But if he had no suspicion of her, how could he be a just man, and yet seek to put her away, being immaculate? He sought, to put her away, because he saw in her a great sacrament, to approach which he thought himself unworthy. — Catena Aurea by Aquinas