“The most Blessed Virgin Mary was, from the first moment of her conception… preserved immune from all stain of original sin.” — Catechism of the Catholic Church, 491This feast honors Mary’s unique grace: her preservation from original sin from the moment of her conception. Chosen and prepared by God to be the Mother of the Savior, Mary is “full of grace” (Luke 1:28) and a model of holiness for all the faithful.