" This catechism aims at presenting an organic synthesis of the essential and fundamental contents of Catholic doctrine, as regards both faith and morals, in the light of the Second Vatican Council and the whole of the Church’s Tradition. Its principal sources are the Sacred Scriptures, the Fathers of the Church, the liturgy, and the Church’s Magisterium. It is intended to serve “as a point of reference for the catechisms or compendia that are composed in the various countries. ” (The prologue of the C.C.C.)
The Catechism of the Catholic Church is a presentation of Church doctrine that has previously been taught with varying degrees of authority. To determine the degree of authority with which any given doctrine has been taught, one must investigate the history of that particular teaching. Look to the Catechism’s footnotes for help in this regard. There you will find references to Church councils, documents, canon law, Scripture, etc., all of varying degrees of authority.
Whatever the underlying degree of authority any given doctrine may carry, Pope John Paul II called the Catechism “a statement of the Church’s faith and of Catholic doctrine, attested to or illumined by Sacred Scripture, the apostolic Tradition, and the Church’s magisterium” (Fidei Depositum 3).