"The fourth opinion is that of Cajetan, for whom (de auctor. papae et con., cap. 20 et 21) the manifestly heretical Pope is not “ipso facto” deposed, but can and must be deposed by the Church. To my judgment, this opinion cannot be defended. For, in the first place, it is proven with arguments from authority and from reason that the manifest heretic is “ipso facto” deposed. The argument from authority is based on St. Paul (Titus, c. 3), who orders that the heretic be avoided after two warnings, that is, after showing himself to be manifestly obstinate - which means before any excommunication or judicial sentence. And this is what St. Jerome writes, adding that the other sinners are excluded from the Church by sentence of excommunication, but the heretics exile themselves and separate themselves by their own act from the body of Christ. Now, a Pope who remains Pope cannot be avoided, for how could we be required to avoid our own head? How can we separate ourselves from a member united to us?
"This principle is most certain. The non-Christian cannot in any way be Pope, as Cajetan himself admits (ib. c. 26). The reason for this is that he cannot be head of what he is not a member; now he who is not a Christian is not a member of the Church, and a manifest heretic is not a Christian, as is clearly taught by St. Cyprian (lib. 4, epist. 2), St. Athanasius (Scr. 2 cont. Arian.), St. Augustine (lib. de great. Christ. cap. 20), St. Jerome (contra Lucifer.) and others; therefore the manifest heretic cannot be Pope.
"To this Cajetan responds (in Apol. pro tract. praedicto cap. 25 et in ipso tract. cap. 22) that the heretic is not a Christian “simpliciter” *, but is one “secundum quid” *. For, granted that two things constitute the Christian - the faith and the [baptismal] character - the heretic, having lost the faith, is still in some way united to the Church and is capable of jurisdiction; therefore, he is also Pope, but ought to be removed, since he is disposed, with ultimate disposition, to cease to be Pope: as the man who is still not dead but is “in extremis” [at the point of death].
"Against this: in the first place, if the heretic remained, “in actu” [actually], united to the Church in virtue of the character, he would never be able to be cut or separated from her “in actu”, for the character is indelible. But there is no one who denies that some people may be separated “in actu” from the Church. Therefore, the character does not make the heretic be “in actu” in the Church, but is only a sign that he was in the Church and that he must return to her. Analogously, when a sheep wanders lost in the mountains, the mark impressed on it does not make it be in the fold, but indicates from which fold it had fled and to which fold it ought to be brought back. This truth has a confirmation in St. Thomas who says (Summ. Theol. III, q. 8, a. 3) that those who do not have the faith are not united “in actu” to Christ, but only potentially - and St. Thomas here refers to the internal union, and not to the external which is produced by the confession of faith and visible signs. Therefore, as the character is something internal, and not external, according to St. Thomas the character alone does not unite a man, “in actu,” to Christ.
"Further against the argument of Cajetan: either faith is a disposition necessary “simpliciter” for someone to be Pope, or it is only necessary for someone to be a good Pope “ad bene esse,” to exist well, to be good, as opposed to simply existing]. In the first hypothesis, in case this disposition be eliminated by the contrary disposition, which is heresy, the Pope immediately ceases to be Pope: for the form cannot maintain itself without the necessary dispositions. In the second hypothesis, the Pope cannot be deposed by reason of heresy, for otherwise he would also have to be deposed for ignorance, immorality, and other similar causes, which impede the knowledge, the morality, and the other dispositions necessary for him to be a good Pope (“ad bene esse papae”). In addition to this, Cajetan recognises (tract. praed., ca. 26) that the Pope cannot be deposed for the lack of dispositions necessary, not “simpliciter”, but only “ad bene esse.”
"To this, Cajetan responds that faith is a disposition necessary “simpliciter”, but partial, and not total; and that, therefore, even if his faith disappears he can still continue being Pope, by reason of the other part of the disposition, the character, which still endures.
"Against this argument: either the total disposition, constituted by the character and by faith, is necessary “simpliciter,” or it is not, the partial disposition then being sufficient. In the first hypothesis, the faith disappearing there no longer remains the disposition “simpliciter” necessary, for the disposition “simpliciter” necessary was the total, and the total no longer exists. In the second hypothesis, the faith is only necessary “ad bene esse”, and therefore its absence does not justify the deposition of the Pope. In addition to this, what finds itself in the ultimate disposition to death, immediately thereafter ceases to exist, without the intervention of any other external force, as is obvious; therefore, also the Pope heretic ceases to be Pope by himself, without any deposition. **
cont…