With the Rosary, the Church will confront the infernal enemy

We well know the Rosary's powerful efficacy to obtain the maternal aid of the Blessed Virgin. By no means is there only one way to pray to obtain this aid. However, we consider the Holy Rosary the most convenient and most fruitful means, as is clearly suggested by the very origin of this practice, heavenly rather than human, and by its nature…

With the meditation of Sacred Mysteries added to the vocal prayers, there emerges another very great advantage, so that all, even the most simple and least educated, have in this prayer a prompt and easy way to nourish and preserve their own faith. What prayers are better adapted and more beautiful than the Lord's Prayer and the angelic salutation that are the flowers with which this mystical crown is formed?

And truly, from the frequent meditation on the Mysteries, the soul little by little and imperceptibly draws and absorbs the virtues they contain, and is wondrously enkindled with a longing for things immortal, and becomes strongly and easily impelled to follow the path which Christ Himself and His Mother have followed. The recitation of identical formulas repeated so many times, rather than rendering the prayer sterile and boring, has on the contrary the admirable quality of infusing confidence in those who pray and brings them to bear a gentle compulsion on the motherly Heart of Mary…

Therefore, we do not hesitate to affirm again publicly that we put great confidence in the Holy Rosary for the healing of the evil that afflicts our times. Not with force, not with arms, not with human power, but with Divine help obtained through the means of this prayer, strong like David with his sling, the Church, undaunted, shall be able to confront the infernal enemy, repeating to him the words of the young shepherd: "Thou comest to me with a sword, and a spear, and with a shield; but I come to thee in the name of the Lord of Hosts, the God of armies . . . and all this assembly shall know that the Lord saveth not with sword and spear, for this is his battle, and he will deliver you into our hands" (I Kings 17, 45-47).

Pope Pius XII, encyclical Ingruentium malorum, on reciting the Rosary, September 15, 1951 (excerpts)