Many of the observances of the 25th anniversary of the Catechism of the Catholic Church noted that it was the most important magisterial act of the Church since the Second Vatican Council. That’s true, and it remains the towering achievement of the historic 35-year pontificate in two acts of Pope St John Paul II and Benedict XVI. Yet the Catechism was important not only for what it taught, but how it taught. It was the needed complement, or completion, of the magisterial gambit of Vatican II.