27 For that reason We say that the Rosary is by far the best prayer by which to plead before her the cause of our separated brethren. To grant a favorable hearing belongs properly to her office of spiritual Mother. For Mary has not brought forth - nor could she - those who are of Christ except in the one same Faith and in the one same love; for "Can Christ be divided?"(17) All must live the life of Christ in an organic unity in order to "bring forth fruit to God"(18) in the one same body. Every one of the multitudes, therefore, whom the mischief of calamitous events has stolen away from that unity, must be born again to Christ of that same Mother whom God has endowed with a never failing fertility to bring forth a holy people. And this Mary, for her part, longs to do. Adorned by us with garlands of her favorite prayer, she will obtain by her entreaties help in abundance from the Spirit that quickeneth. God grant that they refuse not to comply with the burning desire of their merciful Mother but, on the contrary, give ear, like men of good will, with a proper regard for their eternal salvation, to the voice, gently persuasive, which calls to them: "My little children, of whom I am in labor again, until Christ be formed in you."(19)
Source: Adiutricem (Vatican.va)