Encyclical Promulgated on 8 September 1953
To Our Venerable Brethren, the Patriarchs, Primates, Archbishops, Bishops, and other Local Ordinaries in Peace and Communion with the Apostolic See.
Venerable Brethren, Health and Apostolic Benediction.
1. The radiant crown of glory with which the most pure brow of the Virgin Mother was encircled by God, seems to Us to shine more brilliantly, as We recall to mind the day, on which, one hundred years ago, Our Predecessor of happy memory Pius IX, surrounded by a vast retinue of Cardinals and Bishops, with infallible apostolic authority defined, pronounced and solemnly sanctioned “that the doctrine, which holds that the Most Blessed Virgin Mary at the first moment of her conception was, by singular grace and privilege of the Omnipotent God, in virtue of the merits of Jesus Christ, Savior of the Human race, preserved from all stains of original sin, is revealed by God, and therefore to be firmly and resolutely believed by all the faithful.” (Dogmatic bull Ineffabilis Deus, of 8 Dec. 1854.)
2. The entire Catholic world received with joy the pronouncement of the Pontiff, so long and anxiously awaited. Devotion of the faithful to the Virgin Mother of God was stirred up and increased and this naturally led to a great improvement in Christian morality. Furthermore, studies were undertaken with new enthusiasm, which gave due prominence to the dignity and sanctity of the Mother of God.
3. Moreover, it seems that the Blessed Virgin Mary herself wished to confirm by some special sign the definition, which the Vicar of her Divine Son on earth had pronounced amidst the applause of the whole Church. For indeed four years had not yet elapsed when, in a French town at the foot of the Pyrenees, the Virgin Mother, youthful and benign in appearance, clothed in a shining white garment, covered with a white mantle and girded with a hanging blue cord, showed herself to a simple and innocent girl at the grotto of Massabielle. And to this same girl, earnestly inquiring the name of her with whose vision she was favored, with eyes raised to heaven and sweetly smiling, she replied: “I am the Immaculate Conception.”