Pope Honorius who reigned as pope from 625 to 638 AD was condemned as a heretic by Pope Leo in the Sixth Ecumenical Council (680-681 AD) for promoting monotheletism. In monothelitism, it is taught that Christ has only a divine will contrary to the orthodox position that He has two (human and divine wills).
Although there are Roman Catholic apologists who acknowledge this condemnation, they assert that Pope Honorius was not condemned in his official capacity as pope. In order to "preserve" their beloved doctrine of papal infallibility, Roman Catholics give either one of these two escape hatches:
1. He only neglected to fight against monothelitism
2. His teaching of monothelitism did not conform in the conditions of an ex-cathedra declaration and thus he was acting as a private theologian
With regards to number one, this is easily refutable when your read the pronouncement made in the Sixth Ecumenical Council where Pope Honorious was condemned as a heretic and not an incompetent pope.
With respect to number two, the conditions for an ex-cathedra statement was not made until 1870. None of the popes 1,200 years before that know about those conditions, let alone papal infallibility. Read the following excerpts of some of the sessions during the Sixth Ecumenical Council:
Session XIII: The holy council said: After we had reconsidered, according to the promise which we had made to your highness, the doctrinal letters of Sergius, at one time patriarch of this royal God-protected city to Cyrus, who was then bishop of Phasius and to Honorius some time Pope of Old Rome, as well as the letter of the latter to the same Sergius, we find that these documents are quite foreign to apostolic dogmas, to the declarations of the holy Councils, and to all the accepted Fathers, and that they follow the false teachings of the heretics; therefore we entirely reject them, and execrate them as hurtful to the soul. But the names of those men whose doctrines we execrate must also be thrust forth from the holy Church of God, namely, that of Sergius some time bishop of this God-preserved royal city who the first to write on this impious doctrine; also that of Cyrus of Alexandria, of Pyrrhus, Paul, and Peter, who died bishops of this God-preserved city, and were like-minded with them; and that of Theodore, sometime bishop of Pharan, all of whome the most holy and thrice blessed Agatho, Pope of Old Rome, in his suggestion to our most pious and God-preserved lord and mighty Emperor, rejected, because they were minded contrary to our orthodox faith, all of whom we define are to be subject to anathema. And with these we define that there shall be expelled from the holy Church of God and anathematized Honorius who was some time Pope of Old Rome, because of what we found written by him to Sergius, that in all respects he followed his view and confirmed his impious doctrine.
Session XVI: To Theodore of Pharan, the heretic, anathema! To Sergius, the heretic, anathema! To Cyrusm the heretic, anathema! To Honorius, the heretic, anathema! To Pyrrhus, the heretic, anathema! to Paul, the heretic, anathema!...
Note the terms used for Honorius: Heretic and Pope of Old Rome. The doctrines Honorius followed were considered, and we quote, "hurtful to the soul". So it isn't true that Honorius was condemned for negligence or acting as a private theologian. He was condemned in his official capacity as pope. Again, the conditions for an ex-cathedra declarations and the dogma of papal infallibility were unknown during those time.
Reference: Holy Scripture: The Ground and Pillar of our Faith, Volume 2 by William Webster
Although there are Roman Catholic apologists who acknowledge this condemnation, they assert that Pope Honorius was not condemned in his official capacity as pope. In order to "preserve" their beloved doctrine of papal infallibility, Roman Catholics give either one of these two escape hatches:
1. He only neglected to fight against monothelitism
2. His teaching of monothelitism did not conform in the conditions of an ex-cathedra declaration and thus he was acting as a private theologian
With regards to number one, this is easily refutable when your read the pronouncement made in the Sixth Ecumenical Council where Pope Honorious was condemned as a heretic and not an incompetent pope.
With respect to number two, the conditions for an ex-cathedra statement was not made until 1870. None of the popes 1,200 years before that know about those conditions, let alone papal infallibility. Read the following excerpts of some of the sessions during the Sixth Ecumenical Council:
Session XIII: The holy council said: After we had reconsidered, according to the promise which we had made to your highness, the doctrinal letters of Sergius, at one time patriarch of this royal God-protected city to Cyrus, who was then bishop of Phasius and to Honorius some time Pope of Old Rome, as well as the letter of the latter to the same Sergius, we find that these documents are quite foreign to apostolic dogmas, to the declarations of the holy Councils, and to all the accepted Fathers, and that they follow the false teachings of the heretics; therefore we entirely reject them, and execrate them as hurtful to the soul. But the names of those men whose doctrines we execrate must also be thrust forth from the holy Church of God, namely, that of Sergius some time bishop of this God-preserved royal city who the first to write on this impious doctrine; also that of Cyrus of Alexandria, of Pyrrhus, Paul, and Peter, who died bishops of this God-preserved city, and were like-minded with them; and that of Theodore, sometime bishop of Pharan, all of whome the most holy and thrice blessed Agatho, Pope of Old Rome, in his suggestion to our most pious and God-preserved lord and mighty Emperor, rejected, because they were minded contrary to our orthodox faith, all of whom we define are to be subject to anathema. And with these we define that there shall be expelled from the holy Church of God and anathematized Honorius who was some time Pope of Old Rome, because of what we found written by him to Sergius, that in all respects he followed his view and confirmed his impious doctrine.
Session XVI: To Theodore of Pharan, the heretic, anathema! To Sergius, the heretic, anathema! To Cyrusm the heretic, anathema! To Honorius, the heretic, anathema! To Pyrrhus, the heretic, anathema! to Paul, the heretic, anathema!...
Note the terms used for Honorius: Heretic and Pope of Old Rome. The doctrines Honorius followed were considered, and we quote, "hurtful to the soul". So it isn't true that Honorius was condemned for negligence or acting as a private theologian. He was condemned in his official capacity as pope. Again, the conditions for an ex-cathedra declarations and the dogma of papal infallibility were unknown during those time.
Reference: Holy Scripture: The Ground and Pillar of our Faith, Volume 2 by William Webster
