Mopsvestia 1 Roman Catholic writers vary greatly in their estimate of Theodoret's christology and of his general orthodoxy.
In his Christology he departed from the Lutheran and Zwinglian doctrine of the two natures by insisting on what he called the Vergotterung des Fleisches Christi, the deification or the glorification of the flesh of Christ.
He was called there to combat the unitarian christology of Beryllus, bishop of Bostra, and to clear up certain eschatological questions.
Even in the christology, where he is treating of the historical Christ, he entertains critical considerations; hence it is not altogether without reason that in after times he was suspected of "Ebionitic" views of the Person of Christ.
Of these that represented by Severus stood nearest to the Christology of Cyril.