Homily for the Solemnity of Immaculate Conception of the Blessed Virgin Mary

Right after the Fall of Adam and Eve, God reveals His plan to save humanity from sin and eternal death. It involves the defeat of Satan and his offspring by the Woman (Mary) and her Offspring (Jesus). If the Ark of the Old Covenant was made out of the best of the best (silver, gold, etc.), how much more would the Ark of the New Covenant, Mary, have to be pure; the best of the best?