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As I mentioned previously, I also wish to comment on the Eastern Orthodox Church, and how as a Roman Catholic, I reconcile this schism in the Church. Why the Roman Catholic Church rather than the Eastern Orthodox Church?

First of all, let me say that I have great respect for the Eastern Orthodox Church. We have much more in common than we have differences, and I think we are on the brink of a true reconciliation and reunion between the Roman and Orthodox Churches. Surely, this is God's will, that this schism be healed. Roman Catholics are permitted, for example, to attend Eastern Orthodox services. The Churches have both repealed their ex-communication of one another, etc. There is a lot of healing going on.

Nevertheless, at risk of opening wounds rather than healing them, I must speak to why I choose Roman Catholicism as the true Church, as opposed to the Eastern Orthodox. The reason is this: There is a fatal flaw in Orthodoxy's account of how we can know what God has revealed. As Fr. Brian W. Harrison, O.S., has demonstrated, we can use a series of several simple propositions to argue that Eastern Orthodoxy's account of how the Church transmits revelation is vitiated by a circular argument, and so cannot be true.

First, if God has given the gift of infallibility to his Church, there must be some identifiable authority or agent within her capable of exercising that gift. Now, Catholics believe that the College of Bishops—the successors of the apostles, led by the pope, the successor of St. Peter—constitute that authority. The bishops can exercise the gift in several ways (as explained by Vatican Council II in article 25 of Lumen Gentium, the Dogmatic Constitution on the Church). The whole group (the College of Bishops) can teach infallibly, either gathered together in councils that its leader, the pope, recognizes as "ecumenical" (that is, sufficiently representative of the whole Church), or even, under certain conditions, while remaining dispersed around the world. Finally, the pope, even when speaking alone, is guaranteed the charism of infallibility in his most formal (ex cathedra) pronouncements.

Now, what does the Eastern Orthodox communion see as the agent of the infallibility it claims for itself? In fact, it recognizes only one of those forms of teaching mentioned above. Let us highlight this answer:

Proposition 1: Infallibility is to be recognized in the solemn doctrinal decisions of ecumenical councils.

However, does this mean that the Orthodox recognize the authority of all the same ecumenical councils that we Catholics recognize? Unfortunately not. While our separated Eastern brethren claim that, in principle, any ecumenical council between Pentecost and Judgment Day would enjoy the charism of being able to issue infallible dogmatic decrees, they recognize as ecumenical only the first seven councils: those that took place in the first Christian millennium, before the rupture between East and West. Indeed, even though they claim theirs is the true church, since that medieval split they have never attempted to convoke and celebrate any ecumenical council of their own. For they still recognize as a valid part of ancient tradition the role of the See of Peter as enjoying a certain primacy—at least of honor or precedence—over the other ancient centers of Christianity (Constantinople, Antioch, Jerusalem, and Alexandria).

Thus, mainstream Orthodox theologians, as I understand them, would say that for a thousand years we have had a situation of interrupted infallibility. The interruption, they would maintain, has been caused above all by the "ambition," "intransigence" or " hubris" of the bishops of the See of Peter, who are said to have overstepped the due limits of the modest primacy bestowed on them by Jesus. However (it is said), once the Roman pontiffs come to recognize this grave error and renounce their claims to personal infallibility and universal jurisdiction over all Christians, why, then the deplorable schism will at last be healed! The whole Church, with due representation for both East and West, will once again be able to hold infallible ecumenical councils.

This position, however, turns out to involve serious problems. Our separated Eastern brethren acknowledge that any truly ecumenical council will need to include not only their own representatives, but also those of the bishop of Rome, whose confirmation of its decrees would in due course be needed, as it was in those first seven councils of antiquity. Well, so far so good. But does this mean the Orthodox acknowledge that the pope’s confirmation of a council in which they participate will not only be necessary, but also sufficient, as a condition for them to recognize it as ecumenical? Unfortunately, the answer here is again in the negative. And it is the Easterners’ own history which has, as we shall now see, reshaped their theology on this point during the last half-millennium.

After the East-West rupture that hardened as a result of the mutual excommunications of 1054 and the brutal sack of Constantinople by Latin crusaders in 1204, two ecumenical councils were convoked by Rome for the purpose of healing the breach. They were held at Lyons in 1274 and at Florence in 1439, with Eastern Christendom being duly represented at both councils by bishops and theologians sent from Constantinople. And in both cases these representatives ended up fully accepting, on behalf of the Eastern Church, the decrees, promulgated by these councils, that professed the true, divinely ordained jurisdiction of the successors of Peter over the universal Church of Christ—something much more than a mere primacy of honor. And these decrees were of course confirmed by the then-reigning popes.

Why, then, did neither of these two councils effectively put an end to the tragic and long-standing schism? Basically because the Eastern delegations to Lyons and Florence, upon returning to their own constituency, were unable to make the newly decreed union take practical effect. At Constantinople, the nerve-center of the Byzantine Empire, an attitude of deep suspicion and even passionate hostility toward the Latin "enemies" was still strongly ingrained in the hearts and minds of many citizens—great and small alike. The result was that politics and public opinion trumped the conciliar agreements. The Eastern Christians as a whole simply refused to acquiesce in the idea of allowing that man—the widely feared and detested bishop of Rome—to hold any kind of real jurisdiction over their spiritual and ecclesiastical affairs.

As a result, in order to justify their continued separation from Rome, the Orthodox have had to nuance their position on the infallibility of ecumenical councils. They have had to maintain that the participation in a given council of bishops representing the whole Church and the confirmation of their decrees by the pope, while undoubtedly necessary, is still not sufficient to guarantee the true ecumenical status of that council. For over and above the fulfillment of those conditions, it is also necessary (so they have told us in recent centuries) for the faithful as a whole in both East and West—not just the pope and bishops or even the entire clergy—to accept that council’s decrees as expressing the true faith. So the simple Proposition 1 set out above is now modified as follows:

Proposition 2: Infallibility is to be recognized in the solemn doctrinal decisions of those councils which are not only papally confirmed as ecumenical, but which are also subsequently accepted as such by the whole Church.

In the post-Enlightenment Western world, wherein opposition to clericalism (real or imagined), and the ideas of democracy and popular sovereignty have long enjoyed great popularity, this Eastern Orthodox ecclesiology, with its emphasis on the role of the laity, will naturally sound attractive to many. But on further examination a fatal logical flaw in the Orthodox theory comes to light.

Let’s take a closer look here. If the crucial factor in deciding whether a given council’s teaching is infallible or not depends on how it is received by the rank-and-file membership of "the whole Church," then it becomes critically important to know who, precisely, constitutes "the whole Church." How are her members to be identified? Who has voting rights, as it were, in this monumental communal decision?

In answer to this question, our Eastern friends cannot (and do not) say that for these purposes the whole Church consists of all who profess faith in Christ, or all the baptized. For on that basis the Orthodox would rule out as "un-ecumenical" (and thus, non-infallible) not only the second-millennium councils recognized by Rome and the Catholic Church, but also the seven great councils of the first millennium which they themselves recognize in common with Catholics! For each one of those councils was rejected by significant minorities of baptized persons (Arians, Monophysites, Nestorians, etc.) who professed faith in Christ.

It is equally clear that the Orthodox cannot define the whole Church as Catholics do, namely, as consisting of all those Christians who are in communion with Rome, the See of Peter, the "Rock." For they themselves have not been in communion with Rome since medieval times. Could they perhaps try to define the whole Church in terms of communion with their own patriarchal See of Constantinople? No way. As far as I know, no Orthodox theologian has ever dared to claim that the need for union with Constantinople is part of revelation or divine law. For not only was this see itself in heresy at certain periods of antiquity, it did not even exist for several centuries after revelation was completed in the apostolic age.

In short, any Orthodox attempt to define the whole Church in terms of some empirically verifiable criterion will land our Eastern brethren in impossible absurdities. So the only other course open to them, logically, is the one they have now in fact adopted: They attempt to define the whole Church in terms of an empirically unverifiable criterion, namely, adherence to true, orthodox doctrine. Unlike cities, sayings, and sacraments, doctrinal orthodoxy cannot be recognized as such by any of the five senses. It cannot, as such, be seen, touched, or heard—only discerned in the mind and heart. Thus, if we ask the Orthodox why do they not recognize as constituent parts of the whole Church those baptized, Christ-professing Aryans, Nestorians, etc., who rejected one or more of the seven first-millennium councils, they will respond, "Why, because they were unorthodox, of course! They lapsed into heresy while we—and up till that time the Latin Church under Rome as well—maintained the true faith."

Now that the Orthodox position regarding infallibility and ecumenical councils has been further specified, we can reformulate it a third time, replacing the expression "the whole Church" at the end of Proposition 2 with another which clarifies what is meant by those three words:

Proposition 3: Infallibility is to be recognized in the solemn doctrinal decisions of those councils which are not only papally confirmed as ecumenical, but which are also subsequently accepted as such by the whole community of those Christians who adhere to true doctrine.

But here, I am afraid, we come face to face with the fundamental logical flaw in the whole Eastern Orthodox account of how we can know what—if anything—God has revealed to mankind. Since Christ founded his Church on earth to be a visible community, we cannot define her in terms of an invisible criterion—possession of doctrinal truth—without falling into absurdity. The flaw this involves is that of a circular argument—including the term to be defined within the definition itself. This results in a mere tautology: a repetitive proposition that provides no information at all.

We can see this more clearly if we remember that the whole purpose of an infallible church authority is simply to enable Christians to distinguish revealed truth clearly and certainly from falsehood and heresy. Keeping this in mind, we can formulate once again the Eastern Orthodox proposition, rewording Proposition 3 above so as to unpack the word infallible, spelling out its meaning and function:

Proposition 4: Christians can come to know with certainty what is true doctrine by recognizing the solemn doctrinal decisions of those councils which are not only papally confirmed as ecumenical, but which are also subsequently accepted as such by the whole community of those Christians who adhere to true doctrine.

The words italicized above lay bare the underlying circularity—the tautology—that vitiates the logical coherence of Eastern Orthodox Christianity. We want to know how to identify true Christian doctrine with certainty, but the proffered solution to our problem assumes we already know the very thing we are seeking to discover. We are being told, "To discover what is true Christian doctrine, you must pay heed the teaching of those who adhere to true Christian doctrine"!

Reference:
http://www.catholic.com/thisrock/2008/0810fea3.asp