CThomas
How is one to determine definitively whether a Papal pronouncement is an infallible, ex cathedra statement?
From Vatican I (
Pastor Aeternus), for infallibility to be exercised the Pope must teach
(a) ex cathedra (from the Chair of Peter), that is as Shepherd and Teacher of all Christians,
(b) speaking with Peter’s apostolic authority to the whole Church,
(c) defining a doctrine of faith and morals.
So the Pope’s ‘ex cathedra’ definitions may be either of revealed dogma, to be believed with divine faith, or of other truths necessary for guarding and expounding revealed truth. Vatican Council II and the post-conciliar Magisterium have explicitly affirmed that both ecclesial and papal infallibility extend to the secondary doctrinal truths necessary for guarding and expounding revelation. Thus *Humanae Vitae *(Encyclical) against contraception, and
Ordinatio Sacerdotalis (Apostolic Epistle) on male-only priests, contain infallible definitions, to remove all doubt.
Thus, no dogma has to be affirmed, nor anyone anathematized, nor the word “define” or “definition” be used for an infallible papal teaching – only that the Pope is handing down a certain, decisive judgment that a point of doctrine on faith or morals is true and its contrary false.
The CCC #88 (1997) clearly combines exactly with Pope John Paul’s Motu Proprio (= on his own authority) Apostolic Letter
Ad Tuendam Fidem, 1998 (ATF), which requires the assent of divine and Catholic faith to believe (credenda sunt) dogmas (a category one truth) (Canon #750.1); and a category 2 truth requires the assent of ecclesial faith, as a secondary truth, “proposed definitively” (definitive proponuntur) to be “firmly embraced and held” (now Canon 750.2). In fact, the 1983 revision of Canon Law had replaced in #749.3 “dogmatically declared or defined” with “infallibly defined”, thus NOT expressing a limitation of infallibility to dogmas. ATF better enables Canon Law to apply to the understanding of infallibility with the Profession of Faith covering the two categories of infallible doctrine.
Through Google, you can easily access Vatican documents especially *Pastor Aeternus *of Vatican I, and *Lumen Gentium *of Vatican II.
We assent to dogma and doctrine which the Church teaches through Her Ecumenical Councils and the Popes, and to the Bishops when they teach what the Church teaches.