Any study of Catholicism must begin with the Catechism of the Catholic Church. Officially promulgated by Pope John Paul II in 1997, it is the first “universal” Catholic catechism since the Reformation and only the second in history. It is an epochal work that expresses the tenets of the Catholic faith consistent with their articulation at the Second Vatican Council, while remaining in organic unity with the tradition of the Church, drawing in abundance on the sources of Sacred Scripture, the Fathers of the Church, the liturgy, and magisterial authority. If one wants to know what the Catholic Church teaches, the Catechism, as John Paul II stated, is the “sure norm.”