"Our merciful God, as you know, raised up against these most direful enemies [Albigensian heretics] a most holy man [St. Dominic], the illustrious parent and founder of the Dominican order. Great in the integrity of his doctrine, in his example of virtue, and by his apostolic labors, he proceeded undauntedly to attack the enemies of the Catholic Church, not by force of arms; but trusting wholly to that devotion to which he was the first Institute under the name of the holy Rosary, which was the first to disseminate through the length and breadth of the earth by him and his pupils. Guided, in fact, by divine inspiration and grace, he foresaw that this devotion, like a most powerful warlike weapon, would be the means of putting the enemy to flight, and of confounding their audacity and mad impiety…it is one of the most painful and grievous sights to see so many souls, redeemed by the blood of Christ, snatched from salvation by the whirlwind of an age of error, precipitated into the abyss of eternal death. Our need of divine help is as great today as when the great Dominic introduced the use of the Rosary of Mary as a balm for the wounds of his contemporaries."
(Pope Leo XIII – Encyclical Supremi Apostolatus Officio)