As with her lifetime virginity, this is also a special grace and privilege -the Immaculate Conception – just like her Divine Motherhood. Again the Mother of God cannot be under Satan’s power. Therefore she was conceived without the stain of original sin on her soul. That is why we see the Blessed Mother and our Lord in their immaculate perfection as the new Adam and New Eve. Pope Pius IX announced his Ineffabilis Deus about the Dogma on the 8th of December, 1854.
He stated: we declare, pronounce, and define the doctrine that proclaims the Blessed Virgin Mary in the first period of her conception, through the single grace and privilege given by God and the merits of the Lord Jesus Christ the Savior of Mankind, is preserved free from all stains of the original sin.