Dom Aelfred Graham, O.S.B., Repeats the Teaching of Pope Pius XII on Heresy and Separation from the Church

“Certain sins – viz., apostasy, heresy and schism – of their nature cut off the guilty from the living Body of Christ…..It can hardly be denied that those who take up any of these positions – most evidently is this the case with the deliberate apostate – sever themselves by their own act from membership of the Church.”
(The Teaching of the Catholic Church, Volume II, Arranged and Edited by Canon George Smith, New York, 1961, Fourteenth Printing, p. 708)

Did you read that, my friends? Heresy of its very nature separates a heretic from the Church. It is not the judgement of the Church that separates a heretic from the Church. This flies in the face of those who hold (heretically by the way) that one is separated from the Church for heresy only when the Church makes that judgement and not beforehand.

The Divine Law Excludes Heretics from Occupying the Throne of Peter

“Heretics and schismatics are barred from the Supreme Pontificate by the divine law itself… [T]hey must certainly be regarded as excluded from occupying the throne of the Apostolic See, which is the infallible teacher of the truth of the faith and the center of ecclesiastical unity.”
(Maroto, Institutiones I.C. 2:784)

“Appointment to the Office of the Primacy. 1. What is required by divine law for this appointment… Also required for validity is that the one elected be a member of the Church; hence, heretics and apostates (at least public ones) are excluded.”
(Coronata, Institutiones I.C. 1:312)

“All those who are not impeded by divine law or by an invalidating ecclesiastical law are validly eligible [to be elected pope]. Wherefore, a male who enjoys use of reason sufficient to accept election and exercise jurisdiction, and who is a true member of the Church can be validly elected, even though he be only a layman. Excluded as incapable of valid election, however, are all women, children who have not yet arrived at the age of discretion, those afflicted with habitual insanity, heretics and schismatics.”
(Wernz-Vidal, Jus Can. 2:415)

Source:  http://www.fathercekada.com/2007/06/25/can-an-excommunicated-cardinal-be-elected-pope/

Note:  Ecclesia Militans accepts all popes from John XXIII to Benedict XVI as true popes because the indicia of heresy do not amount to public manifest formal heresy in their cases.  For more on this, please refer to Fr. Paul Kramer’s two volume set of To Deceive the Elect.