Luke 1:43

(non occ. vide Theoph. et. Tit. Bost.) Now in saying this, she coincides with her son. For John also felt that he was unworthy of our Lord's coming to him. But she gives the name of "the mother of our Lord" to one still a virgin, thus forestalling the event by the words of prophecy. Divine foreknowledge brought Mary to Elisabeth, that the testimony of John might reach the Lord. For from that time Christ ordained John to be a prophet. Hence it follows, For, to, as soon as the voice of thy salutation sounded, &c.

She says it not ignorantly, for she knew it was by the grace and operation of the Holy Spirit that the mother of the prophet should be saluted by the mother of his Lord, to the advancement and growth of her own pledge; but being aware that this was of no human deserving, but a gift of Divine grace, she therefore says, Whence is this to me, that is, By what right of mine, by what that I have done, for what good deeds?

(super Ezech. lib. i. Hom. i. 8.) She was touched with the spirit of prophecy at once, both as to the past, present, and future. She knew that Mary had believed the promises of the Angel; she perceived when she gave her the name of mother, that Many was carrying in her womb the Redeemer of mankind; and when she foretold that all things would be accomplished, she saw also what was to follow in the future.

(Severus.) From this place we derive the refutation of Eutyches, in that Christ is stated to be the fruit of the womb. For all fruit is of the same nature with the tree that bears it. It remains then that the virgin was also of the same nature with the second Adam, who takes away the sins of the world. But let those also who invent curious fictions concerning the flesh of Christ, blush when they hear of the real child-bearing of the mother of God. For the fruit itself proceeds from the very substance of the tree. Where too are those who say that Christ passed through the virgin as water through an aqueduct? Let these consider the words of Elisabeth who was filled with the Spirit, that Christ was the fruit of the womb. It follows, And whence is this to me, that the mother of my Lord should come to me?