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The Catholic Church’s teaching on papal infallibility is one which is generally misunderstood by those outside the church. In particular, fundamentalists and other “Bible Christians” often confuse the charism of papal “infallibility” with “impeccability.” They imagine Catholics believe the pope cannot sin. Others,

who avoid this elementary blunder, think the pope relies on some sort of amulet or magical incantation when an infallible definition is due.

Given these common misapprehensions regarding the basic tenets of papal infallibility, it is necessary to explain exactly what infallibility is not. Infallibility is not the absence of sin. Nor is it a charism that belongs only to the pope. Indeed, infallibility also belongs to the body of bishops as a whole, when, in doctrinal unity with the pope, they solemnly teach a doctrine as true. We have this from Jesus himself, who promised the apostles and their successors the bishops, the magisterium of the church: “He who hears you hears me” (Luke 10:16), and “Whatever you bind on earth shall be bound in heaven” (Matt. 18:18).

 

Vatican II’s Explanation
Vatican II explained the doctrine of infallibility as follows: “Although the individual bishops do not enjoy the prerogative of infallibility, they can nevertheless proclaim Christ’s doctrine infallibly. This is so, even when they are dispersed around the world, provided that while maintaining the bond of unity among themselves and with Peter’s successor, and while teaching authentically on a matter of faith or morals, they concur in a single viewpoint as the one which must be held conclusively. This authority is even more clearly verified when, gathered together in an ecumenical council, they are teachers and judges of faith and morals for the universal church. Their definitions must then be adhered to with the submission of faith” (Lumen Gentium 25).

Infallibility belongs in a special way to the pope as head of the bishops (Matt. 16:17–19; John 21:15–17). As Vatican II remarked, it is a charism the pope “enjoys in virtue of his office, when, as the supreme shepherd and teacher of all the faithful, who confirms his brethren in their faith (Luke 22:32), he proclaims by a definitive act some doctrine of faith or morals. Therefore his definitions, of themselves, and not from the consent of the church, are justly held irreformable, for they are pronounced with the assistance of the Holy Spirit, an assistance promised to him in blessed Peter.”

The infallibility of the pope is not a doctrine that suddenly appeared in church teaching; rather, it is a doctrine which was implicit in the early church. It is only our understanding of infallibility which has developed and been more clearly understood over time. In fact, the doctrine of infallibility is implicit in these Petrine texts: John 21:15–17 (“Feed my sheep...”), Luke 22:32 (“I have prayed for you that your faith may not fail”), and Matthew 16:18 (“You are Peter...”).

 

Based on Christ’s Mandate
Christ instructed the church to preach everything he taught (Matt. 28:19–20) and promised the protection of the Holy Spirit to “guide you into all the truth” (John 16:13). That mandate and that promise guarantee the church will never fall away from his teachings (Matt. 16:18, 1 Tim. 3:15), even if individual Catholics might.

As Christians began to more clearly understand the teaching authority of the church and of the primacy of the pope, they developed a clearer understanding of the pope’s infallibility. This development of the faithful’s understanding has its clear beginnings in the early church. For example, Cyprian of Carthage, writing about 256, put the question this way, “Would the heretics dare to come to the very seat of Peter whence apostolic faith is derived and whither no errors can come?” (Letters 59 [55], 14). In the fifth century, Augustine succinctly captured the ancient attitude when he remarked, “Rome has spoken; the case is concluded” (Sermons 131, 10).

 

Some Clarifications
An infallible pronouncement—whether made by the pope alone or by an ecumenical council—usually is made only when some doctrine has been called into question. Most doctrines have never been doubted by the large majority of Catholics.

Pick up a catechism and look at the great number of doctrines, most of which have never been formally defined. But many points have been defined, and not just by the pope alone. There are, in fact, many major topics on which it would be impossible for a pope to make an infallible definition without duplicating one or more infallible pronouncements from ecumenical councils or the ordinary magisterium (teaching authority) of the church.

At least the outline, if not the references, of the preceding paragraphs should be familiar to literate Catholics, to whom this subject should appear straightforward. It is a different story with “Bible Christians.” For them papal infallibility often seems a muddle because their idea of what it encompasses is often incorrect.

Some ask how popes can be infallible if some of them lived scandalously. This objection of course, illustrates the common confusion between infallibility and impeccability. There is no guarantee that popes won’t sin or give bad example. (The truly remarkable thing is the great degree of sanctity found in the papacy throughout history; the “bad popes” stand out precisely because they are so rare.)

Other people wonder how infallibility could exist if some popes disagreed with others. This, too, shows an inaccurate understanding of infallibility, which applies only to solemn, official teachings on faith and morals, not to disciplinary decisions or even to unofficial comments on faith and morals. A pope’s private theological opinions are not infallible, only what he solemnly defines is considered to be infallible teaching.

Even fundamentalists and evangelicals who do not have these common misunderstandings often think infallibility means that popes are given some special grace that allows them to teach positively whatever truths need to be known, but that is not quite correct, either. Infallibility is not a substitute for theological study on the part of the pope.

What infallibility does is prevent a pope from solemnly and formally teaching as “truth” something that is, in fact, error. It does not help him know what is true, nor does it “inspire” him to teach what is true. He has to learn the truth the way we all do—through study—though, to be sure, he has certain advantages because of his position.

 

Peter Not Infallible?
As a biblical example of papal fallibility, fundamentalists like to point to Peter’s conduct at Antioch, where he refused to eat with Gentile Christians in order not to offend certain Jews from Palestine (Gal. 2:11–16). For this Paul rebuked him. Did this demonstrate papal infallibility was non-existent? Not at all. Peter’s actions had to do with matters of discipline, not with issues of faith or morals.

Furthermore, the problem was Peter’s actions, not his teaching. Paul acknowledged that Peter very well knew the correct teaching (Gal. 2:12–13). The problem was that he wasn’t living up to his own teaching. Thus, in this instance, Peter was not doing any teaching; much less was he solemnly defining a matter of faith or morals.

Fundamentalists must also acknowledge that Peter did have some kind of infallibility—they cannot deny that he wrote two infallible epistles of the New Testament while under protection against writing error. So, if his behaviour at Antioch was not incompatible with this kind of infallibility, neither is bad behaviour contrary to papal infallibility in general.

Turning to history, critics of the church cite certain “errors of the popes.” Their argument is really reduced to three cases, those of Popes Liberius, Vigilius, and Honorius, the three cases to which all opponents of papal infallibility turn; because they are the only cases that do not collapse as soon as they are mentioned. There is no point in giving the details here—any good history of the church will supply the facts—but it is enough to note that none of the cases meet the requirements outlined by the description of papal infallibility given at Vatican I (cf. Pastor Aeternus 4).

 

Their 'Favourite Case'
According to fundamentalist commentators, their best case lies with Pope Honorius. They say he specifically taught Monothelitism, a heresy that held that Christ had only one will (a divine one), not two wills (a divine one and a human one) as all orthodox Christians hold.

But that’s not at all what Honorius did. Even a quick review of the records shows he simply decided not to make a decision at all. As Ronald Knox explained, “To the best of his human wisdom, he thought the controversy ought to be left unsettled, for the greater peace of the church. In fact, he was an in-opportunist. We, wise after the event, say that he was wrong. But nobody, I think, has ever claimed that the pope is infallible in not defining a doctrine.”