The Church has preserved from its beginnings the certainty that Mary is “Immaculate”, that is, there is no sin in her.
It is in the middle of the 19th century that Pope Pius IX, after receiving numerous requests from bishops and faithful from all over the world, in full communion with the entire Church, proclaimed the bull “Ineffabilis Deus” (Ineffable God) with which it was decreed this Marian dogma:
“That the doctrine which maintains that the Blessed Virgin Mary was preserved immune from all stains of original guilt in the first instant of her conception by the singular grace and privilege of omnipotent God, in attention to the merits of Christ Jesus, Savior of the human race , is revealed by God and must therefore be firmly and constantly believed by all the faithful…” (Pius IX, “Ineffabilis Deus”)