ST FRANCIS DE SALES:

"Now when he is explicitly a heretic, he falls ipso facto from his dignity and out of the Church, and the Church must either deprive him, or, as some say, declare him deprived, of his Apostolic See, and must say as S. Peter did: Let another take his bishopric" - The Catholic Controversy (p306 in my edition)

When St Francis says "explicitly a heretic", does that mean a material heretic, or a formal heretic? Formal, I would say, because nobody is a heretic and outside the Church simply on account of a materially heretical statement.

Sean, why do you continue to ignore the three Doctors of the Church I’ve quoted?

Especially after Vatican I, I prefer to learn from:

Saint Alphonsus, Saint Robert Bellarmine, Saint Francis de Sales, Saint Antoninus, Pope Paul IV, Pope Innocent III, Coronata, Vermeersch, Regatillo, Wernz-Vidal among many others.

“…and the Church must deprive him…”

You ‘accidentally’ forgot to include that part.

This chair of Peter cannot fail, what does it mean? It's not rocket science:

"'I have prayed for thee that thy faith not fail; and when you have converted, strengthen your brethren' (Luke 22:31). From this text, St Bernard in letter 90 to Pope Innocent deduced that the Roman Pontiff teaching ex cathedra cannot err; and before him the same was said by Pope Lucius I in letter I to the Bishops of Spain and France, by Pope Felix I in a letter to Benignus, Pope Mark in a letter to Athanasius, Leo I in sermon 3..., Leo IX in a letter to Peter Patriarch of Antioch, Agatho in a letter to the Emperor Constantine IV which was read at the Sixth Council (act 4 and again act 8) and approved by the whole Council, Pope Paschal II at the Roman Council..., Innocent III in the chapter Majores on Baptism and its effect... Therefore, if the Roman Pontiff cannot err when he is teaching ex cathedra, certainly his judgement must be followed... For we read Acts ch 15 that the Council said: 'It has seemed good to the Holy Ghost and to us'; such also now is the Pontiff's teaching ex cathedra, whom we showed is always directed by the Holy Ghost so that he cannot err." - St Robert Bellarmine, On the Word of God, Lib 3, Cap 5

"But since, in this very age in which the salutary efficacy of the Apostolic office is most of all required, not a few are found who take away from its authority, We judge it altogether necessary to assert solemnly the prerogative which the only-begotten Son of God found worthy to join with the supreme pastoral office. Therefore, faithfully adhering to the tradition received from the beginning of the Christian faith, for the glory of God Our Saviour, the exaltation of the Catholic Religion, and the salvation of Christian people, the Sacred Council approving, We teach and define that it is a divinely-revealed dogma: that the Roman Pontiff, when he speaks ex Cathedra, that is, when in discharge of the office of Pastor and Teacher of all Christians, by virtue of his supreme Apostolic authority, he defines a doctrine regarding faith or morals to be held by the Universal Church, by the divine assistance promised to him in blessed Peter, is possessed of that infallibility with which the divine Redeemer willed that His Church should be endowed for defining doctrine regarding faith or morals: and that therefore such definitions of the Roman Pontiff are irreformable of themselves, and not from the consent of the Church. But if anyone - God forbid - whould presume to contradict this our definition; let him be anathema." - Pastor Aeternus

"It should not be said that the Pontiff is infallible simply because of the authority of the Papacy but rather inasmuch as he is certainly and undoubtedly subject to the direction of the divine assistance. By the authority of the Papacy the Pontiff is always the supreme judge in matters of faith and morals, and the father and teacher of all Christians. But the divine assistance promised to him, by which he cannot err, he only enjoys as such when he really and actually exercises his duty as supreme judge and universal teacher of the Church in disputes about the Faith. Thus, the sentence 'The Roman Pontiff is infallible' should not be treated as false, since Christ promised infallibility to the person of Peter and his successors, but it is incomplete, since the Pope is only infallible when, by a solemn judgement, he defines a matter of faith and morals for the Church universal" - Bishop Vincent Gasser, Official Relatio on Infallibility of Vatican I

BILLUART (+1757):

"The more common opinion holds that Christ, by a particular providence, for the common good and the tranquility of the Church, continues to give jurisdiction to an even manifestly heretical pontiff until such time as he should be declared a manifest heretic by the Church" - De Fide, Diss V, A III No 3 Obj 2

You have to be quite gullible to believe that Avrille fabricated a quote, and some anonymous Irish blogger has discovered it.

I’ll contact Avrille and ask for a response.

Good! If they don’t give a response, would you consider looking into the reference yourself?