From: Luke 1:46-56
 And Mary said, "My soul magnifies the Lord,  and my spirit rejoices in God my Savior,  for He has regarded the low estate of His handmaiden. For behold, henceforth all generations will call me blessed;  for He who is mighty has done great things for me, and holy is His name.  And His mercy is on those who fear Him from generation to generation.  He has shown strength with His arm, He has scattered the proud in the imagination of their hearts,  He has put down the mighty from their thrones, and exalted those of low degree;  He has filled the hungry with good things, and the rich He has sent empty away.  He has helped His servant Israel, in remembrance of His mercy,  as He spoke to our fathers, to Abraham and to his posterity for ever."
 And Mary remained with her about three months, and returned to her home.
46-55. Mary's "Magnificat" canticle is a poem of singular beauty. It evokes certain passages of the Old Testament with which she would have been very familiar (especially 1 Samuel 2:1-10).
Three stanzas may be distinguished in the canticle: in the first (verses 46-50) Mary glorifies God for making her the Mother of the Savior, which is why future generations will call her blessed; she shows that the Incarnation is a mysterious __expression of God's power and holiness and mercy. In the second (verses 51-53) she teaches us that the Lord has always had a preference for the humble, resisting the proud and boastful. In the third (verses 54-55) she proclaims that God, in keeping with His promise, has always taken care of His chosen people--and now does them the greatest honor of all by becoming a Jew (cf. Romans 1:3).
"Our prayer can accompany and imitate this prayer of Mary. Like her, we feel the desire to sing, to acclaim the wonders of God, so that all mankind and all creation may share our joy" ([St] J. Escriva, "Christ Is Passing By", 144).
46-47. "The first fruits of the Holy Spirit are peace and joy. And the Blessed Virgin had received within herself all the grace of the Holy Spirit" (St. Basil, "In Psalmos Homilae", on Psalm 32). Mary's soul overflows in the words of the "Magnificat". God's favors cause every humble soul to feel joy and gratitude. In the case of the Blessed Virgin, God has bestowed more on her than on any other creature. "Virgin Mother of God, He whom the heavens cannot contain, on becoming man, enclosed Himself within your womb" ("Roman Missal", Antiphon of the Common of the Mass for Feasts of Our Lady). The humble Virgin of Nazareth is going to be the Mother of God; the Creator's omnipotence has never before manifested itself in as complete a way as this.
48-49. Mary's __expression of humility causes St. Bede to exclaim: "It was fitting, then, that just as death entered the world through the pride of our first parents, the entry of Life should be manifested by the humility of Mary" ("In Lucae Evangelium Expositio, in loc.").
"How great the value of humility!--"Quia respexit humilitatem.... It is not of her faith, nor of her charity, nor of her immaculate purity that our Mother speaks in the house of Zachary. Her joyful hymn sings: `Since He has looked on my humility, all generations will call me blessed'" ([St] J. Escriva, "The Way", 598).
God rewards our Lady's humility by mankind's recognition of her greatness: "All generations will call me blessed." This prophecy is fulfilled every time someone says the Hail Mary, and indeed she is praised on earth continually, without interruption. "From the earliest times the Blessed Virgin is honored under the title of Mother of God, under whose protection the faithful take refuge together in prayer in all their perils and needs. Accordingly, following the Council of Ephesus, there was a remarkable growth in the cult of the people of God towards Mary, in veneration and love, in invocation and imitation, according to her own prophetic words: `all generations will call me blessed, for He who is mighty has done great things for me'" (Vatican II, "Lumen Gentium", 66).
50. "And His mercy is on those who fear Him from generation to generation": "At the very moment of the Incarnation, these words open up a new perspective of salvation history. After the Resurrection of Christ, this perspective is new on both the historical and the eschatological level. From that time onwards there is a succession of new generations of individuals in the immense human family, in ever-increasing dimensions; there is also a succession of new generations of the people of God, marked with the sign of the Cross and of the Resurrection and `sealed' with the sign of the paschal mystery of Christ, the absolute revelation of the mercy that Mary proclaimed on the threshold of her kinswoman's house: "His mercy is [...] from generation to generation' [...].
"Mary, then, is the one who has the "deepest knowledge of the mystery of God's mercy". She knows its price, she knows how great it is. In this sense, we call her the "Mother of Mercy": Our Lady of Mercy, or Mother of Divine Mercy; in each one of these titles there is a deep theological meaning, for they express the special preparation of her soul, of her whole personality, so that she was able to perceive, through the complex events, first of Israel, then of every individual and of the whole of humanity, that mercy of which `from generation to generation' people become sharers according to the eternal design of the Most Holy Trinity" (John Paul II, "Dives In Misericordia", 9).
51. "The proud": those who want to be regarded as superior to others, whom they look down on. This also refers to those who, in their arrogance, seek to organize society without reference to, or in opposition to, God's law. Even if they seem to do so successfully, the words of our Lady's canticle will ultimately come true, for God will scatter them as He did those who tried to build the Tower of Babel, thinking that they could reach as high as Heaven (cf. Genesis 11:4).
"When pride takes hold of a soul, it is no surprise to find it bringing along with it a whole string of other vices--greed, self-indulgence, envy, injustice. The proud man is always vainly striving to dethrone God, who is merciful to all His creatures, so as to make room for himself and his ever cruel ways.
"We should beg God not to let us fall into this temptation. Pride is the worst sin of all, and the most ridiculous.... Pride is unpleasant, even from a human point of view. The person who rates himself better than everyone and everything is constantly studying himself and looking down on other people, who in turn react by ridiculing his foolish vanity" ([St] J. Escriva, "Friends of God", 100).
53. This form of divine providence has been experienced countless times over the course of history. For example, God nourished the people of Israel with manna during their forty years in the wilderness (Exodus 16:4-35); similarly His angel brought food to Elijah (1 Kings 19:5-8), and to Daniel in the lions' den (Daniel 14:31-40); and the widow of Sarepta was given a supply of oil which miraculously never ran out (1 Kings 17:8ff). So, too, the Blessed Virgin's yearning for holiness was fulfilled by the incarnation of the Word.
God nourished the chosen people with His Law and the preaching of His prophets, but the rest of mankind was left hungry for His word, a hunger now satisfied by the Incarnation. This gift of God will be accepted by the humble; the self-sufficient, having no desire for the good things of God, will not partake of them (cf. St. Basil, "In Psalmos Homilae", on Psalm 33).
54. God led the people of Israel as He would a child whom He loved tenderly: "the Lord your God bore you, as a man bears his son, in all the way that you went" (Deuteronomy 1:31). He did so many times, using Moses, Joshua, Samuel, David, etc., and now He gives them a definitive leader by sending the Messiah--moved by His great mercy which takes pity on the wretchedness of Israel and of all mankind.
55. God promised the patriarchs of old that He would have mercy on mankind. This promise He made to Adam (Genesis 3:15), Abraham (Genesis 22:18), David (2 Samuel 7:12), etc. From all eternity God had planned and decreed that the Word should become incarnate for the salvation of all mankind. As Christ Himself put it, "God so loved the world that He gave His only Son, that whoever believes in Him should not perish but have eternal life" (John 3:16).
Source: "The Navarre Bible: Text and Commentaries". Biblical text taken from the Revised Standard Version and New Vulgate. Commentaries made by members of the Faculty of Theology of the University of Navarre, Spain. Published by Four Courts Press, Kill Lane, Blackrock, Co. Dublin, Ireland. Reprinted with permission from Four Courts Press and Scepter Publishers, the U.S. publisher.