9. The Magisterium of the Church, however, teaches a doctrine to be *believed as divinely revealed* (first paragraph) or to be *held definitively* (second paragraph) with an act which is either *defining* or *non-defining*. In the case of a *defining* act, a truth is solemnly defined by an "ex cathedra" pronouncement by the Roman Pontiff or by the action of an ecumenical council. In the case of a *non-defining* act, a doctrine is taught *infallibly* by the ordinary and universal Magisterium of the Bishops dispersed throughout the world who are in communion with the Successor of Peter. *Such a doctrine can be confirmed or reaffirmed by the Roman Pontiff, even without recourse to a solemn definition*, by declaring explicitly that it belongs to the teaching of the ordinary and universal Magisterium as a truth that is divinely revealed (first paragraph) or as a truth of Catholic doctrine (second paragraph). Consequently, when there has not been a judgment on a doctrine in the solemn form of a definition, but this doctrine, belonging to the inheritance of the *depositum fidei*, is taught by the ordinary and universal Magisterium, which necessarily includes the Pope, such a doctrine is to be understood as having been set forth infallibly.17 The declaration of *confirmation* or *reaffirmation* by the Roman Pontiff in this case is not a new dogmatic definition, but a formal attestation of a truth already possessed and infallibly transmitted by the Church.
10. The third proposition of the *Professio fidei* states: "Moreover, I adhere with religious submission of will and intellect to the teachings which either the Roman Pontiff or the College of Bishops enunciate when they exercise their authentic Magisterium, even if they do not intend to proclaim these teachings by a definitive act." To this paragraph belong *all those teachings * on faith and morals - presented as true or at least as sure, even if they have not been defined with a solemn judgment or proposed as definitive by the ordinary and universal Magisterium*. Such teachings are, however, an authentic expression of the ordinary Magisterium of the Roman Pontiff or of the College of Bishops and therefore require *religious submission of will and intellect*.18 They are set forth in order to arrive at a deeper understanding of revelation, or to recall the conformity of a teaching with the truths of faith, or lastly to warn against ideas incompatible with these truths or against dangerous opinions that can lead to error.19
A proposition contrary to these doctrines can be qualified as *erroneous* or, in the case of teachings of the prudential order, as *rash* or *dangerous* and therefore "tuto doceri non potest".20