Since Vatican II, the way Catholics celebrate each sacrament has been revised. We can better understand those changes if we appreciate the sacramental theology on which these changes are based. "An important step in enriching our understanding of sacrament is to see Jesus himself, in his humanity, as the first and original sacrament. It all starts with Jesus. Jesus himself is our sacrament, our visible sign of the invisible God," writes Richstatter. "The sacraments allow us to become conscious and aware of God's greatest gift: the creative, sustaining, loving presence of God."