Does the Holy Spirit Proceed from the Father or from the Father _and_ the Son? That’s one of the reasons for the split. Another is the Roman Church claim of being Supreme rather than a council of equals. But for me when I was involved, the biggest distinction was one of the things that really drew me into Orthodoxy at the time vs any others: The Essence vs Energies. It helped clarify the medicinal nature of faith and the transfiguration of matter

That’s one of the reasons for the split.

Another is the Roman Church claim of being Supreme rather than a council of equals.

But for me when I was involved, the biggest distinction was one of the things that really drew me into Orthodoxy at the time vs any others: The Essence vs Energies. It helped clarify the medicinal nature of faith and the transfiguration of matter