From Pope Francis' Bull of Indiction
Misericordiae Vultus (24):
My thoughts now turn to the Mother of Mercy. May the sweetness of your countenance watch over us in this Holy Year, so that all of us may rediscover the joy of God's tenderness. No one has penetrated the profound mystery of the incarnation like Mary. Her entire life was patterned after the presence of mercy made flesh. The Mother of the Crucified and Risen One has entered the sanctuary of divine mercy because she participated intimately in the mystery of His love.
Chosen to be the Mother of the Son of God, Mary, from the outset, was prepared by the love of God to be the Ark of the Covenant between God and man. She treasured divine mercy in her heart in perfect harmony with her Son Jesus. Her hymn of praise, sung at the threshold of the home of Elizabeth, was dedicated to the mercy of God which extends from "generation to generation" (Lk 1.:50). We too were included in those prophetic words of the Virgin Mary. This will be a source of comfort and strength to us as we cross the threshold of the Holy Year to experience the fruits of divine mercy.
At the foot of the Cross, Mary, together with John, the disciple of love, witnessed the words of forgiveness spoken by Jesus. This supreme expression of mercy towards those who crucified him show us the point to which the mercy of God can reach. Mary attests that the mercy of the Son of God knows no bounds and extends to everyone, without exception. Let us address her in the words of the Salve Regina, a prayer ever ancient and ever new, so that she may never tire of turning her merciful eyes upon us, and make us worthy to contemplate the face of mercy, her Son Jesus.