Ambrose of Milan
Catena Aurea · Lukasevangelium 1
And Mary arose in those days, and went into the hill country with haste, into a city of Juda; And entered into the house of Zacharias, and saluted Elisabeth. And it came to pass, that, when Elisabeth heard the salutation of Mary, the babe leaped in her womb; and Elisabeth was filled with the Holy Ghost: And she spake out with a loud voice, and said, Blessed art thou among women, and blessed is the fruit of thy womb. And whence is this to me, that the mother of my Lord should come to me? For, lo, as soon as the voice of thy salutation sounded in my ears, the babe leaped in my womb for joy. And blessed is she that believed: for there shall be a performance of those things which were told her from the Lord.
The Angel, when he announced the hidden mysteries to the Virgin, that he might build up her faith by an example, related to her the conception of a barren woman. When Mary heard it, it was not that she disbelieved the oracle, or was uncertain about the messenger, or doubtful of the example, but rejoicing in the fulfilment of her wish, and consicentious in the observance of her duty, she gladly wentforth into the hill country. For what could Mary now, filled with God, (plena Deo) but ascend into the higher parts with haste!