Source? I don’t see how to teach that the Orthodox, who actively deny the filioque , are in heresy is in contradiction of the teaching of the Church.
Source for which? On the issues of the filioque, run through older threads on the
byzcath.org forums. It’s long and involved.
In short, the Filioque is more a linguistic issue than theological :headbang:
The greek word used in the creed means that the Spirit proceeds
in origin from the Father. The Roman church teaches that the Spirit also proceeds
temporally through the Son. Load these into one verb, and
of course the greek-speaking world has conniptions, as the notion that the Spirt originates in the Son is indeed heretical. (OK, for the unfair cheap shot at the trade: see, the vernacular
is a bad idea: if Rome hadn’t started using the vernacular in the third and fourth centuries, and had stayed with the traditional greek, we never would have had this problem!

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)
Either way, I suppose I just never considered that communion could be broken without heresy occurring.
Quite possible, and downright common.
The most recent example is the RO and GO, over the Estonian Orthodox Church and the GO (i.e., the Patriarch of Constantinople bringing EO reps to an inter-Orthodox meeting.
I suppose that happened at the time we had three “popes.”
Parts of the RCC would probably have been out of communion with other parts–and that was the least of the RCC’s problems at the tie . . .
So does this mean that when a church gets a new patriarch, communion is broken until he requests communion with Rome? And that also, it’s not 100% necessary to be in communion with Rome to be considered Catholic by Rome?
Not so much “broken” as “not yet”. But communicants generally would not be denied the Eucharist at such times either.
And until, for example, the new Melkite Patriarch’s representative to Rome gets there and is accepted, the two churches aren’t quite either in or out of communion.
“Interregnums” [ouch, that plural hurts!] have long been odd legal issues (and, as an Economist, I’d use the term for the US economy from roughly 2008-16, between the recession and the actual recovery).
hawk