"No sin would touch her, so that she would be a fitting and worthy vessel of the Son of God. The Immaculate Conception does not refer to the virginal conception and the birth of Christ, but rather to Mary's being conceived without inheriting Original Sin." (United States Catholic Catechism for Adults, 142-143) On this Solemnity of the Immaculate Conception, a Holy Day of Obligation, attend Mass and pray the Hail Mary before meals.