It brings us the glad tidings of this economy of the Saviour altogether to be praised, to wit, that to them who had wandered astray the way of salvation was shown, and that to the despairing the grace of salvation was made known, which blesses all in different modes; searching after the erring, enlightening the blinded, giving life to the dead, setting free the slaves, redeeming the captives, and becoming all things to all of us in order to be the true way of salvation to us: and all this He does, not by reason of our goodwill toward Him, but in virtue of a benignity that is proper to our Benefactor Himself.
For the Saviour did all, not in order that He might acquire virtue Himself, but that He might put us in possession of eternal life. He made man, indeed, after the image of God, and appointed him to live in a paradise of pleasure. But the man being deceived by the devil, and having become a transgressor of the divine commandment, was made subject to the doom of death. Whence, also, those born of him were involved in their father's liability in virtue of their succession, and had the reckoning of condemnation required of them.
“For death reigned from Adam to Moses.” But the Lord. in His benignity toward man, when He saw the creature He Himself had formed now held by the power of death, did not turn away finally from him whom He had made in His own image, but visited him in each generation, and forsook him not; and manifesting Himself first of all among the patriarchs, and then proclaiming Himself in the law, and presenting the likeness of Himself in the prophets, He presignified the economy of salvation.
When, moreover, the fullness of the times came for His glorious appearing, He sent beforehand the archangel Gabriel to bear the glad tidings to the Virgin Mary. And he came down from the ineffable powers above to the holy Virgin, and addressed her first of all with the salutation, “Hail, thou that art highly favoured.” And when this word, “Hail, thou that art highly favoured,” reached her, in the very moment of her hearing it, the Holy Spirit entered into the undefiled temple of the Virgin, and her mind and her members were sanctified together.
And nature stood opposite, and natural intercourse at a distance, beholding with amazement the Lord of nature, in a manner contrary to nature, or rather above nature, doing a miraculous work in the body; and by the very weapons by which the devil strove against us, Christ also saved us, taking to Himself our passible body in order that He might impart the greater grace to the being who was deficient in it. And “where sin abounded, grace did much more abound.” And appropriately was grace sent to the holy Virgin.
For this word also is contained in the oracle of the evangelic history: “And in the sixth month the angel Gabriel was sent to a virgin espoused to a man whose name was Joseph, of the house and lineage of David; and the virgin's name was Mary;” and so forth. And this was the first month to the holy Virgin. Even as Scripture says in the book of the law: “This month shall be unto you the beginning of months: it shall be the first month among the months of the year to you.” “Keep the feast of the holy passover to the Lord in all your generations.” it was also the sixth month to Zacharias.
And rightly, then, did the holy Virgin prove to be of the family of David, and she had her home in Bethlehem, and was betrothed rightfully to Joseph, in accordance with the laws of relationship. And her espoused husband was her guardian, and possessor also of the untarnished incorruption which was hers. And the name given to the holy Virgin was one that became her exceedingly. For she was called Mary, and that, by interpretation, means illumination. And what shines more brightly that the light of virginity? For this reason also the virtues are called virgins by those who strive rightly to get at their true nature. But if it is so great a blessing to have a virgin heart, how great a boon will it be to have the flesh that cherishes virginity along with the soul!
Source: Four Homilies (New Advent)