This is logically impossible, because either a person fully accepts the faith, sacraments, and ecclesiastical governance (this is necessary to be in communion with the Church), or he does not.
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I am just going with the current practice of the Church (permitting communicatio in sacris under what, compared with past practice, are fairly liberal circumstances), and how Rome refers to the Orthodox as “sister Churches”. I am going to assume — and I will welcome correction or clarification — that the ancient sees of Alexandria, Constantinople, Antioch, and Jerusalem are regarded by Rome as still existing (not sure about Moscow, they came along later), though not in communion with Rome, not accepting the Bishop of Rome as (at least titular) temporal head of the Church, and are a prorupted part of the One True Church. In other words, these particular Churches did not cease existing when the schism took place. As particular Churches, then, do they still retain authority — in the eyes of Rome — even though there is a situation of schism? Or do they derive, in the Catholic view, all of their authority to do anything — including granting faculties to administer sacraments and even to bless — from Rome, and rejecting Rome, they lose that authority? That certainly does not seem to be the present view and approach of the Church, if indeed it ever was. If I am understanding Rome’s position correctly, that is why “uniatism” is now rejected — “look, it was bad ecclesiology, we admit that, we shouldn’t have erected uniate churches as parallel structures to yours, your Churches are true, particular, apostolic Churches, that didn’t disintegrate with the schism, what’s done is done, but we wouldn’t do it again”. Am I correct on this?
@dochawk, I know I am going to owe you a steak dinner (or at least lunch at that In-N-Out near the SSPX chapel) if my son and I ever make it out to Las Vegas, I pester you so much on matters Eastern, but can you weigh in on this?