Filled with God, where would she hasten but to the heights? The Holy Spirit does not proceed by slow, laborious efforts. Quickly, too, the blessings of her coming and the Lord’s presence are made clear: as soon as Elizabeth heard Mary’s greeting the child leapt in her womb, and she was filled with the Holy Spirit.
Notice the contrast and the choice of words. Elizabeth is the first to hear Mary’s voice, but John is the first to be aware of grace. She hears with the ears of the body, but he leaps for joy at the meaning of the mystery. She is aware of Mary’s presence, but he is aware of the Lord’s: a woman aware of a woman’s presence, the forerunner aware of the pledge of our salvation. The women speak of the grace they have received while the children are active in secret, unfolding the mystery of love with the help of their mothers, who prophesy by the spirit of their sons.
-- Saint Ambrose of Milan from his commentary on Luke
