Immaculate Mother, the Mediatrix and Co-Redemptrix: "Every kind of grace we receive from the treasury of the redemption is ministered as it were from the hands of the Virgin."

Unsurprisingly, Inter sodalicia is no longer available on the Vatican website, though others of His Holiness's Apostolic Letters are.

From Rorate Cæli

By His Holiness Pope Benedict XV

Quæ est ista quæ progreditur quasi aurora consurgens, pulchra ut luna, electa ut sol, terribilis ut castrorum acies ordinata?

Who is she that cometh forth as the morning rising, fair as the moon, bright as the sun, terrible as an army set in array?

Canticles (Song of Solomon), vi, 9

***

Because the Doctors of the Church by common consent profess that, if the Most Blessed Virgin did not apparently have any participation in the public life of Jesus Christ, and then suddenly reappeared on the path to Calvary and under the Cross, she could not have been present without Divine design.

 

For, as she suffered and almost died together with her suffering and dying Son, she gave up her rights as mother over this Son for the salvation of men and, to appease Divine justice, she, as much as it pertained to her [quantum ad se pertinebat], immolated Him, so that it can be said appropriately that she has, together with Christ, redeemed the human race [ipsam cum Christo humanum genus redemisse].

But if for this reason, every kind of grace we receive from the treasury of the redemption is ministered as it were through the hands of the same Sorrowful Virgin, everyone can see that a holy death should be expected from her, since it is precisely by this gift that the work of the Redemption is effectively and permanently completed in each one. (...)

... further, there is a most constant belief among the faithful, proved by long experience, that as many as employ the same Virgin as Patron will not at all perish forever.

Benedict XV

Inter sodalicia

March 22, 1918