The intention of the Church, in this Feast, is not only to celebrate the anniversary of the happy moment in which began, in the womb of the pious Anne, the life of the ever-glorious Virgin Mary; but also to honour the sublime privilege, by which Mary was preserved from the Original Stain, which, by a sovereign and universal decree, is contracted by all the children of Adam the very moment they are conceived in their mother's womb.
The faith of the Catholic Church on the subject of the Conception of Mary is this: that at the very instant when God united the soul of Mary, which He had created, to the body which it was to animate, this ever-blessed soul did not only not contract the stain, which at that same instant defiles every human soul, but was filled with an immeasurable grace which rendered her, from that moment, the mirror of the sanctity of God Himself, as far as this is possible to a creature. The Church with her infallible authority, declared, by the lips of Pius IX , that this article of her faith had been revealed by God Himself. The Definition was received with enthusiasm by the whole of Christendom, and the eighth of December of the year 1854 was thus made one of the most memorable days of tile Church's history.
It was due to His Own infinite sanctity that God should suspend, in this instance, the law which His Divine justice had passed upon all the children of Adam. The relations which Mary was to bear to the Divinity, could not be reconciled with her undergoing the humiliation of this punishment. She was not only daughter of the eternal Father; she was destined also to become the very Mother of the Son, and the veritable bride of the Holy Ghost.
Nothing defiled could be permitted to enter, even for an instant of time, into the creature that was thus predestined to contract such close relations with the adorable Trinity; not a speck could be permitted to tarnish in Mary that perfect purity which the infinitely holy God requires even in those who are one day to be admitted to enjoy the sight of His Divine majesty in Heaven; in a word, as the great Doctor St. Anselm says, 'it was just that this holy Virgin should be adorned with since God the Father was to give to her, as her Child, that only-begotten Son, Whom He loved as Himself, as being begotten to Him from His Own bosom; and this in such a manner, that the self-same Son of God was, by nature, the Son of both God the Father and this blessed Virgin. This same Son chose her to be substantially His Mother; and the Holy Ghost willed that in her womb He would operate the conception and birth of Him from Whom He Himself proceeded.' [the greatest purity which can be conceived after that of God Himself]
This truth of Mary's Immaculate Conception-----which was revealed to the Apostles by the Divine Son of Mary, inherited by the Church, taught by the holy fathers, believed by each generation of the Christian people with an ever increasing explicitness-----was implied in the very notion of a Mother of God. To believe that Mary was Mother of God, was implicitly to believe that she, on whom this sublime dignity was conferred, had never been defiled with the slightest stain of sin, and that God had bestowed upon her an absolute exemption from sin. But now the Immaculate Conception of Mary rests on an explicit definition dictated by the Holy Ghost. Peter has spoken by the mouth of Pius; and when Peter has spoken, every Christian should believe; for the Son of God has said: 'I have prayed for thee, Peter, that thy faith fail not.' And again: 'The Holy Ghost, Whom the Father will send in My name, He will teach you all things, and bring all things to your mind, whatsoever I shall have said to you.'
God Bless you all , through Holy Mother Mary and Her Immaculate Conception !