"[4] Invoking Mary under the title Helper of Christians, Leo urges the faithful to have recourse to her.

"The Eternal Son of God [...] did not accomplish His design without adding there the free consent of the elect Mother, who represented in some sort all human kind, according to the illustrious and just opinion of St. Thomas, who says that the Annunciation was effected with the consent of the Virgin standing in the place of humanity.

"[5] St. Dominic’s devotion to the rosary is noted: "the devotion was begun and spread abroad by the holy Patriarch Dominic as a most potent weapon against the enemies of the faith at an epoch not, indeed, unlike our own, of great danger to our holy religion.

The heresy of the Albigenses had ...overrun many countries, and this most vile off spring of the Manicheans [...] There seemed to be no human hope of opposing this fanatical and most pernicious sect when timely succor came from on high through the instrument of Mary's Rosary.

Thus under the favor of the powerful Virgin, the glorious vanquisher of all heresies"[6] In every September for the next seven years following the writing of Octobri Mense in September 1891, Pope Leo XIII dedicated the month of October to the Rosary through the authorship of an encyclical.