Factually, the understanding of the dogma of papal infallibility has been developed by Bl John Paul II, after Vatican II (
Lumen Gentium, 25) reaffirmed the teaching of Vatican I: “The Roman Pontiff, head of the college of bishops, enjoys this infallibility in virtue of his office, when, as supreme pastor and teacher of all the faithful – who confirms his brethren in the faith (cf. Lk 22:32) – he proclaims in an absolute decision a doctrine pertaining to faith or morals.”
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.
The CCC #88 (1997) clearly combines exactly with Bl 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) (#750.1);
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.
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 three levels of teaching are:
1) Dogma – infallible (Canon #750.1) to be believed with the assent of divine and Catholic faith.
2) Doctrine – infallible (Canon #750.2) requires the assent of ecclesial faith, to be “firmly embraced and held”.
3) Doctrine – non-definitive (non-infallible) and requires intellectual assent (“loyal submission of the will and intellect”, Vatican II, *Lumen Gentium
25), not an assent of faith. [See the Explanatory Note on ATF by the Congregation for the Doctrine of the Faith]
ewtn.com/library/CURIA/CDFADTU.HTM
Answer by David Gregson of EWTN on Nov-22-2002:
“You are correct in stating that the Pope exercises his charism of infallibility not only in dogmatic definitions issued, ex cathedra, as divinely revealed (of which there have been only two), but also in doctrines definitively proposed by him, also
ex cathedra, which would include canonizations (that they are in fact Saints, enjoying the Beatific Vision in heaven), moral teachings (such as contained in
Humanae vitae), and other doctrines he has taught as necessarily connected with truths divinely revealed, such as that priestly ordination is reserved to men. Further details on levels of certainty with which the teachings of the Magisterium (either the Pope alone, or in company with his Bishops) may be found in
Summary of Categories of Belief.”