With such an array of proof no conservative historian, it would seem, can question the fact that Honorius, the Pope of Rome, was condemned and anathematized as a heretic by the Sixth Ecumenical Council and that the Popes after him used their authority to uphold the decision against him.
Thus spake Fr. Ambrose, Orthodox monk and no friend of Rome!
Pope Honorius. The charge against
Pope Honorius is a double one: that, when appealed to in the
Monothelite controversy, he actually taught the
Monothelite heresy in his two letters to Sergius; and that he was condemned as a heretic by the
Sixth Ecumenical Council, the decrees of which were approved by
Leo II. But in the first place it is quite clear from the tone and terms of these letters that, so far from intending to give any final, or
ex cathedra, decision on the doctrinal question at issue, Honorius merely tried to allay the rising bitterness of the controversy by securing silence. In the next place, taking the letters as they stand, the very most that can be clearly and incontrovertibly deduced from them is, that Honorius was not a profound or acute theologian, and that he allowed himself to be confused and misled by the wily Sergius as to what the issue really was and too readily accepted the latter’s misrepresentation of his opponents’ position, to the effect that the assertion of two wills in
Christ meant two contrary or discordant wills. **Finally, in reference to the condemnation of Honorius as a heretic, it is to be remembered that there is no ecumenical sentence affirming the fact either that Honorius’s letters to Sergius contain heresy, or that they were intended to define the question with which they deal. The sentence passed by the fathers of the council has ecumenical value only in so far as it was approved by
Leo II; but, in approving the condemnation of Honorius, his successor adds the very important qualification that he is condemned, not for the doctrinal reason that he taught heresy, but on the moral ground that he was wanting in the vigilance expected from him in his Apostolic office and thereby allowed a heresy to make headway which he should have crushed in its beginnings. **
newadvent.org/cathen/07790a.htm
In plain English, Honorius did not teach error (which would violate the principle of infallibility), but he was at fault for not putting an end to a heresy quickly.
Thus, the enemies of papal infallibility are thwarted in their attempts to use Honorius as “proof” that infallibility is false.