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.
-Saint
John Paul II, Dives in Misericordia