God the Son assumed a human nature into the unity of His person and so became the principle of our salvation. In the person and work of Jesus the desire of Israel (and implicitly of all the nations) for the peace of the messianic Kingdom found its fulfillment. The hymn of thanksgiving in Isaiah 12 if fulfilled in Jesus’ person and work: “Behold, God is my salvation; I will trust, and will not be afraid; for the LORD GOD is my strength and my song, and he has become my salvation. With joy you will draw water from the wells of salvation. Give thanks to the LORD, call upon his name; make known his deeds among the nations, proclaim that his name is exalted. Sing praises to the LORD, for he has done gloriously; let this be known in all the earth. Shout, and sing for joy, O inhabitant of Zion, for great in your midst is the Holy One of Israel” (Isaiah 12:2-3, 4bcd-6).
Mary—the perfect image of the hope of Israel, more than any other and because of the grace of her Immaculate Conception—longed to see the salvation of her people. In love, she uttered her “fiat” to the angel who said that the son who would be virginally born of her would “save his people from their sins” (Matthew 1:21). Jesus, Son of God and son of Mary, became the source of salvation to all who believe in Him (cf. Isaiah 12:2, Gaudium et Spes ¶17, John 3:16). Through Mary’s Magnificat the joy of Israel is perfectly expressed for indeed the Holy One of Israel is incarnate—He is great in our midst.
Br Paschal Mary, MFVA