Dear brother Hesychios,
Monophysitism and Miaphysitism share two theological terminologies:
- “OF TWO NATURES.” Diophysitism, in distinction, uses the phrase “IN TWO NATURES.”
- “ONE NATURE OF CHRIST.” Diophysitism, in distinction, uses the phrase “TWO NATURES OF CHRIST.”
However, the Monophysite heresy taught that the human nature of Christ was completely absorbed in his divine nature after the union, and no longer existed. This was the heresy of Eutyches which the Oriental Orthodox and the Chalcedonians both condemn.
In distinction from Monophysitism, Miaphysites don’t teach that the human nature of Christ disappeared after the union. We believe that the nature of Christ is one, but it is a composite of His human and divine natures.
The Christological Agreements between the OOC’s and the CC affirm that our Lord has two distinct Natures, human and Divine, which are joined hypostatically in the one Person of Jesus Christ, without confusion, without admixture, without change. The OOC’s admitted that the Catholics, by stressing the two natures, did not intend to deny the hypostatic union. The CC admitted that the OOC’s, by stressing the one (composite) nature, did not intend to deny that Christ in a real way had two distinct natures. Basically, our Churches agreed that even while utilizing different theological terminologies, they were teaching the same thing.