One incarnate nature of the Word.
The Word did not attach himself to a man — God became one of us without ceasing to be God. Divinity and humanity are united in Christ without mingling, confusion or alteration, out of two natures, one. When Chalcedon said in two natures, Alexandria heard two Christs and refused.
The formula is Cyril of Alexandria's — one incarnate nature of God the Word — and it was orthodox everywhere before 451. Chalcedon's in two natures was meant to exclude Eutyches, who taught that Christ's humanity was absorbed by his divinity; Alexandria agreed that Eutyches was wrong and still would not use the phrase, because in its ears two natures split the one Christ into a pair. The Coptic church has anathematised Eutyches for fifteen centuries while being called Eutychian for just as long. Miaphysite is the term the church accepts; monophysite is the term it rejects, and the difference between them is the whole argument.
The same ground, other faiths
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