St. Augustine wonderfully summarizes the three dimensions of Jesus' prayer: "He prays for us as our priest, prays in us as our Head, and is prayed to by us as our God. Therefore let us acknowledge our voice in him and his in us." 87
Catechism number 2619
That is why the Canticle of Mary,91 The Magnificat (Latin) or Megalynei (byzantine) is the song both of the Mother of God and of the Church; the song of the Daughter of Zion and of the new People of God; the song of thanksgiving for the fullness of graces poured out in the economy of salvation and the song of the "poor" whose hope is met by the fulfillment of the promises made to our ancestors, "to Abraham and to his posterity for ever."