You misunderstand it is has nothing to do with the Papacy secure, insecure or otherwise. Rather it is because the ‘barque of the church has been commited to st peter and it is for him to guide it avoding the shipwreck of souls’. The fact is like it or not the Popes ‘Supreme, plenary and universal jurisdiction’ is De Fide, I therefore have no need to wonder whether or not the East will fall into heresy if it elects its own bishops, promulugates its own canon law and liturgical norms, rather I merely believe in the promise of Christ that ‘And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it’ Therefore I simply believe.
If we fall into heresy, the Pope will correct us as he always has and always will. Until then, the
assumption that our natural state is to fall into heresy is exactly what I’m objecting to, and what I find insulting. A little trust would go a long way.
Other than that, I think I only remain in disagreement with you about the following points: your contention that we (the Orthodox, both in communion with Rome and not) are in fact heretics (a misunderstanding of Orthodoxy on your part), your contention that the terms “Catholic Church” and “Roman Catholic Church” are strictly coterminous and your denial of the existence of the particular Church of Rome, your insistence that all the councils under question have universal significance rather than either dealing with local disciplinary issues in the West or condemning heresies that were never present in the East and therefore more or less irrelevant to daily life there, and your insistence that the term “Ecumenical Council” and not just the acceptance of its teachings be accepted in the East.
It’s been a long discussion and I’m not sure if anyone made clear the motivation for keeping only seven Ecumenical Councils. Besides the natural psychological symbolism of the number “seven” (it denotes completion, e.g. the seven days of the week, etc.), last Sunday was the Sunday of the Fathers of the Seven Ecumenical Councils (or “first six” as the liberalized new translation gives it, keeping the possibility open for more, rejecting both the Council
in Trullo and the anti-Photian 4th Council of Constantinople, but losing the traditional meaning and numerical symbolism). And the seventh ecumenical council was the “Triumph of Holy Orthodoxy” - which in the story of the struggle of the Orthodox Faith through the various heresies that challenged it is the completion, the triumphant conclusion, of the story. Further developments of course did happen, but only as the deepening or conclusion of the Triumph of Holy Orthodoxy (the Sunday of St. Gregory Palamas, celebrating the triumph at the council of Constantinople-Blachernae in 1351 of the doctrine of divinization and hesychasm over the nominalist proto-Lutheran imputed justification of Barlaam of Calabria, is celebrated the very next Sunday as the completion of the Sunday of Holy Orthodoxy, and other dogmatic definitions like those made in the West are really just wrap-ups in the story for us, since they don’t relate to any major struggle in the East). We have
liturgical reasons for upholding seven ecumenical councils and no more, and this makes sense in the East but not in the West - and I don’t think this is something a Roman Catholic would have any reason to dispute.
I’ll grant you that the teachings of your councils are
de fide - it doesn’t mean the words chosen to express them don’t reflect a particular theological culture, since they are expressed in the Latin language which has different overtones than words in the Greek language. (You can’t avoid this inculturation, and you shouldn’t want to try.) Again, I have no wish to dispute them, only to preserve the orthodox theological expression of my own church without making any artificial liturgical changes inorganic to our tradition and culture. (We changed our liturgy pretty much every time a new doctrine was defined, in order to incarnate that teaching in our Liturgy and force the heretics to leave - hence the addition of the iconostasis, the many prayers to the Theotokos put in our Liturgy, the Symbol of Constantinople added after 381, etc. Catholics also add a prayer before receiving Communion, namely “O Lord, I also believe and profess that this which I am about to receive is truly your most precious Body, and your Life-giving Blood, which I pray, make me worthy to receive, for the remission of all my sins, and for life everlasting, Amen. O God, be merciful to me a sinner. O God, cleanse me of my sins, and have mercy on me. O Lord, forgive me, for I have sinned without number.” It’s technically a Latinization, one which was eventually printed in the Liturgy because nobody could be stopped from saying it, but not part of the original Liturgy, though this is one Latinization I’m not complaining about. (We live surrounded by Protestants, so it makes sense for us to proclaim our faith in the True Presence.) It reflects our own understanding of the Eucharist, without the philosophical baggage of “transubstantiation” (no “species” mentioned there!).