Kolokotronis, is this the basis of what the Orthodox Churches teach on the validity of the Catholic Eucharist? From what I remember reading about your participation in eucharistic benedictions when you were younger, it would seem to me that you, at the very least, believe in the validity of our Mass.
... Should you?
I know it's been awhile since they burned people for such things and no one wants apologies, etc., but this seemed like the time to ask...
"Kolokotronis, is this the basis of what the Orthodox Churches teach on the validity of the Catholic Eucharist?"
I don't think so. What Met. John is speaking about is that the fullness of The Church is to be found in a single diocese. But note how this true theogoical genius, a man of great personal piety and spirituality, ties this to the universal Church and primacy within that universal Church. This is in accord with the teachings of +Ignatius of Antioch on both The Church and The Eucharist. Orthodoxy's acceptance of the validity of the Eucharist in the Western Church derives from the validity of its orders and a very long a detailed history in various councils about how to deal with sacraments of "schismatics".
As for me, well I never doubted the validity of a Latin Rite Mass, (or any Latin Rite sacrament) even before I knew anything about theology.