124 In order that favors in greater abundance may flow on all Christians, nay, on the whole human race, from the devotion to the most Sacred Heart of Jesus, let the faithful see to it that to this devotion the Immaculate Heart of the Mother of God is closely joined. For, by God's Will, in carrying out the work of human Redemption the Blessed Virgin Mary was inseparably linked with Christ in such a manner that our salvation sprang from the love and the sufferings of Jesus Christ to which the love and sorrows of His Mother were intimately united. It is, then, entirely fitting that the Christian people - who received the divine life from Christ through Mary - after they have paid their debt of honor to the Sacred Heart of Jesus should also offer to the most loving Heart of their heavenly Mother the corresponding acts of piety affection, gratitude and expiation. Entirely in keeping with this most sweet and wise disposition of divine Providence is the memorable act of consecration by which We Ourselves solemnly dedicated Holy Church and the whole world to the spotless Heart of the Blessed Virgin Mary.(125)
Source: Haurietis Aquas (Vatican.va)