Annunciation of the Lord

The mystery of the Annunciation is the beginning of Mary's Journey with Her Divine Son. She, a faithful daughter of of God, chosen by the Father, now receives the invitation to allow the salvation of the world to come through her into our world.
John Paul II, in his Apostolic Letter : Rosarium Virginis Mariae, reflects on Mary's help to us in our devotion and love for Jesus.

Mary's memories

11. Mary lived with her eyes fixed on Christ, treasuring his every word: “She kept all these things, pondering them in her heart” (Lk 2:19; cf. 2:51). The memories of Jesus, impressed upon her heart, were always with her, leading her to reflect on the various moments of her life at her Son's side. In a way those memories were to be the “rosary” which she recited uninterruptedly throughout her earthly life.

Even now, amid the joyful songs of the heavenly Jerusalem, the reasons for her thanksgiving and praise remain unchanged. They inspire her maternal concern for the pilgrim Church, in which she continues to relate her personal account of the Gospel. Mary constantly sets before the faithful the “mysteries” of her Son, with the desire that the contemplation of those mysteries will release all their saving power. In the recitation of the Rosary, the Christian community enters into contact with the memories and the contemplative gaze of Mary.