Luke 2:19

But Mary kept all these things, and pondered them in her heart putting them together and comparing them not as Bede would have it, the prophecies made about Christ by the prophets, but the things seen and reported by the shepherds with reference to the angels the "Gloria in excelsis," &c., with what she had experienced herself the annunciation of Gabriel, the prophecy of Elizabeth and of Zacharias, and the other things which she herself had witnessed and felt in herself. And this she did, first, that seeing the wondrous harmony all things agreeing so well together she might be the more confirmed in her faith that the only begotten Son of God was born of her. So speaks S. Ambrose. Secondly, that by the sweet contemplation of these circumstances so consonant among themselves, she might feed her mind, and look with sure hope for the rest namely, that God would bring this work to an end, and redeem mankind by Christ. Thirdly, that in good time she might unfold all these things and narrate them in order to the apostles, and especially to S. Luke, who was destined to write of them. Observe here in the Virgin the rare example of maidenly silence and modesty, of heavenly prudence, and of the firmest faith and hope, as she wonders at the present and waits for the future. She was comparing the signs of deepest loneliness which she saw with what she knew of His Supreme Majesty, the stable with heaven, the swaddling clothes with that which is spoken of in Ps. civ., "covered with light as with a garment," the crib with the throne of God, the beasts with the seraphim.