9 Among the various supplications with which we successfully appeal to the Virgin Mother of God, the Holy Rosary without doubt occupies a special and distinct place. This prayer, which some call the Psalter of the Virgin or Breviary of the Gospel and of Christian life , was described and recommended by Our Predecessor of happy memory, Leo XIII, with these vigorous passages: "Very admirable is this crown interwoven with the angelic salutation which is interposed in the Sunday prayer, and unites with it the obligation of interior meditation. It is an excellent manner of prayer . . . and very useful for the attainment of immortal life" ( Acta Leonis , 1898, Vol. XVIII, pp. 154, 155).
Source: Ingravescentibus Malis (Vatican.va)