In “Humanae Vitae” the Pope taught, with the divine assistance he enjoys (cf. “Lumen Gentium”, n. 25a), what the Church’s ordinary Magisterium had always held to be true and right, and what had been reconfirmed by the extraordinary Magisterium of Vatican II. The arguments of those who claim to pass judgment on the basis of their knowledge do not stand up against this Magisterium: between the two teachings there is a substantial difference of quality and not only of degree. The teaching of “Humanae Vitae” is Magisterium - though ordinary - which contains decisions belonging to a divinely established authority (cf. canon 331; “Lumen Gentium” nn. 18a, 20c, 22b, 23c; “Christus Dominus” n. 2a) and exercised in order to interpret and teach (as in our case) the moral norms of human conduct. If he were not the Pope, he would lose his legitimate power and the intrinsic reason for his ministry; at most he could carry out a scholarly magisterium, which, however, would not be of use to the Church and to which he has not been appointed by the Church’s Founder; he would lack the supernatural “virtus” of assisting and confirming his brethren in the faith and in the moral law (cf. Lk. 22:32, Mt. 16:29; Vatican I, Dogm. Const. “Pastor Aeternus”, DS 3074).