“Is it any wonder, then, that the soul feels the need, after saying this prayer and experiencing so profoundly the motherhood of Mary, to burst forth in praise of the Blessed Virgin, either in that splendid prayer the Salve Regina or in the Litany of Loreto? This is the crowning moment of an inner journey which has brought the faithful into living contact with the mystery of Christ and his Blessed Mother.” Pope John Paul II, Rosarium Virginis Mariae, no. 37
FWIW, I am not yet convinced that it’s grammatically defensible to claim that “our life” (etc.) refers to “mercy” as opposed to Mary. The second line, like the first, is also a greeting:
Salve, regina, mater misericordiae,
vita, dulcedo, et spes nostra, salve.
In English:
Hail, queen, mother of mercy,
life, sweetness, and our hope, hail.
If it’s interpreted “Mercy = Jesus, not Mary = Life, etc.” (rather than “Mercy refers to Jesus, life refers to Mary”) then the prayer greets two people at the beginning, calling into question what the antecedent to the following pronouns is…?