The Great Commentary of Cornelius a Lapide: S. Luke
Shall overshadow thee. S. Gregory (33 Moral c. 2) explains thus, “The Word of God in thee will assume a body, which will be as it were a shadow of Deity, for it will as a shadow veil and conceal It.” And again he says (18 Moral. 12), “The human body in thee shall receive the incorporeal light of Divinity.” Origen says also, that the Body of Christ is called a shadow, because in the Passion it was humiliated and obscured after the manner of a shadow.
S. Ambrose (on Psalm 119) understands by the shadow this present and mortal life which the Spirit gave to Christ, for this is, as it were, a shadow of the true life and of eternity.
S. Augustine (Quaest. V. et N. T. c. 15) says, The power of the Highest shall overshadow thee, i.e. shall attemper itself to thee, as a shadow adjusts itself to a body, for thy human weakness could not contain the fulness of its force and power.
But more simply, the meaning is, It will cover thee as with a veil, i.e., will secretly work a mighty operation in thee; for it will be such and so great a one that no man or angel can penetrate into or comprehend it. For, first, it will form in thee the perfect humanity of Christ; and, secondly, it will unite the same in a certain ineffable manner to the Person of the Word.
Again, to overshadow may be taken as answering to the Hebrew word anan, to cover with a cloud, and so to rain upon, for a cloud pours forth rain, and hence by the shadow and the cloud is signified rain, which is poured forth from the cloud and renders the earth fruitful. An allusion seems to be made to Psalm lxxi. 6, He shall come down like the rain into a fleece of wool.
Wherefore that Holy Thing which shall be born of Thee shall be called the Son of God. Because the Holy Spirit will come upon thee, and cause thee to conceive a son, the Son which shall be born of thee will be holy from His very conception, yea, the Holy of Holies, because He will be called, and through His hypostatic union with the Word will truly be, the natural and Only Begotten Son of God, and will be called so by God, by angels, and by men; for He who is conceived by the Holy Spirit must needs be most Holy. Maldonatus somewhat differently says, “Jesus is called the Son of God, because He will not be begotten as the rest of men are, but by God through the power of the Spirit, and therefore He will be holy, and the Son of God.” So (Luke iii. 38) Adam is called the Son of God, because he was created not by man but by God.
He says, That Holy Thing, not Man, to show that this Son will not be a mere man, but besides being a man will also be God (S. Greg. xviii. Moral. c. 27); and also to declare that Jesus will be holy with a holiness altogether perfect and natural on account of the hypostatic union (Suarez, 3 p. disp. 18 sect. 1): so that the meaning is, Jesus, Who will be born of thee, will be Most Holy, yea, Holiness itself.
S. Bernard (Serm. 4 super Missus Est) says, “Why does he say merely that Holy Thing, and no more? Because there was not any proper or worthy expression that he could use. If he had said that holy flesh, or that holy man, or whatever expression of such a kind he had used, he would have seemed to himself to have said but little. He uses, therefore, the indefinite expression, That Holy Thing; because whatever it was that the Virgin brought forth, It was without doubt holy and in a singular manner holy, both through the sanctification of the Spirit and the assumption of the Word.”
The Son of God by nature, Who would make all the faithful, sons of God by grace.
Ver. 36. — And, behold, thy cousin Elizabeth. The angel confirms the miracle of the coming birth of Jesus of the Virgin and the Holy Spirit by the similar miracle of the conception of John by Elizabeth who was barren. At the same time he silently admonishes the Blessed Virgin that she should visit John and Elizabeth, and fill them with the Holy Spirit by saluting them.
For with God nothing shall be impossible (Vulgate, non omne verbum, no word, which is a Hebraism), i.e. nothing, however difficult or incredible to man; or, as others take it, no word, i.e., no promise; which means that God is able to perform all things that He has promised, because He is omnipotent; and He will really perform them because He is faithful. He says word, because it is as easy to God to do a thing as it is to us to speak a word, and because He spake a word only and all things were made. “Inasmuch as,” says S. Bernard (Serm. 4 on Missus Est), “with God neither does His word fall short of His intention, because He is Truth; nor His deed fall short of His word, because He is Power; nor the manner (in which the deed is done) fall short of the deed, because He is Wisdom.” “God,” says S. Augustine (lib. 5 de Civ. c. 10), “can do all things except those things which to be able to do is a mark not of power, but of weakness; and which if he were able to do He would not be omnipotent; such as to die, to deceive, to err, to sin.”
The angel stood, and was silent, eagerly expecting the answer and consent of the Virgin. Whence S. Bernard (Serm. 4, super Missus Est) says, that Adam and all the patriarchs and prophets, being anxious concerning the coming of the Messiah and the salvation of men, were waiting for this consent; and he adds “the whole world, prostrate at thy knees, is waiting for this: and rightly, since on thy words depend the consolation of the miserable, the redemption of the captives, the liberation of the damned, the salvation, in short, of all the sons of Adam. Make answer, O Virgin, speedily, speak the word which earth, which the dwellers below and the dwellers on high are waiting for. The King and Lord of all things Himself desires thine assent, by which His purpose is to save the world.”
Ver. 38. — And Mary said, &c. Mark the humility, modesty, and resignation of the Virgin, for though saluted by the angel as Mother of God, she calls herself His handmaid, not His mother; handmaid, mother by grace. Pet. Dam. (Serm. 3 de Nativ. Virg.) And S. Bernard (Serm. in Apoc. 12) says, “A great sign: deservedly is she made mistress of all who declared herself servant of all.”
Be it unto me (Fiat). This word shows that she consented and yielded her assent to the angel with respect to the conception of the Word; also that she wished, desired, and earnestly prayed for the Incarnation of the Messiah, so that He might redeem and save mankind. For this the Blessed Virgin most ardently desired and prayed for. “Be it so, is a mark of desire, not a sign of doubt.” S. Bernard (Serm. 4 sup. Missus Est).
There is a question at what precise moment the Son of God became incarnate. 1. Andrew of Crete is of opinion that He was incarnate before the angel came to the Blessed Virgin. For his words, the Lord is with thee, clearly signify that the King Himself had come.
2. Nicephorus maintains that Christ became incarnate when the angel saluted her and said Hail, thou art full of grace (Lib. i. c. 8). S. Jerome (Ep. 140) and S. Gregory Thaumaturgus favour this opinion.
3. Others appear to think that He became incarnate when the Angel said The Lord is with thee. S. Augustine (Serm. 2 de Annunc.) and S. Thomas (3 p. qu. 30 art. 4) and others so explain it.
But these opinions cannot be true; because the angel after the Hail, &c. adds, Behold, thou shalt conceive in thy womb; therefore she had not yet conceived. Again the Blessed Virgin giving her assent to the angel says, Be it unto me according to thy word; therefore it had not yet taken place.
I say then that the Word was incarnate as soon as the Blessed Virgin had given her assent to the angel; for he was sent for this purpose; for it was not fitting that Christ should be conceived without the consent or knowledge of His Virgin Mother; as soon then as she had spoken the words, Behold the handmaid of the Lord; Be it unto me according to thy word, the Holy Spirit formed the Body of Christ, and joined It Hypostatically to the Word, or Person of the Son of God; in the same way as when the priest in consecration says, This is my Body, by the power of these words the bread is transubstantiated into the Body of Christ. This again is clear from the fact that as soon as the Virgin had given her consent the angel, having, as it were, fulfilled his mission, departed from her. It is confirmed too by the fact that soon after the Blessed Virgin had said Be it unto me, &c., when she saluted Elizabeth, being saluted by her in return she was called the Mother of the Lord, i.e. of Christ Who is God. The Virgin, therefore, when she said, Be it unto me, &c., was made as it were the spouse of God, and our flesh was made the spouse of the Word.