@shortstories @RoninGrey As it turns out, there are really nine councils in EO whose authority are considered “Ecumenical”; the first seven, the Photian Council, and the Palamite Council. While these are indeed considered non-negotiable, the Deposit of Faith really extends even beyond them.
It must be understood though; the whole Orthodox approach to the very question of “authority” is often quite distinct from Western views. The Latin Communion in Rome seem to think in terms of “will not believing this make me go to hell after I die?” By contrast, Orthodox Christians are more immediately concerned with the healing of the soul, cleansing from sin and its effects, that sort of thing. We think of Church more like a hospital, than an attorney. To me the Orthodox take makes more sense, and resonates better with the Gospel Narrative.