The Orthodox Father's and The Angel
The impiety of Servetus was even more detestable when he asserted that God was never revealed to Abraham and the other patriarchs, but that in his place an angel was worshiped. But the orthodox doctors of the church have rightly and prudently interpreted that chief angel to be God's Word, who already at that time, as a sort of a foretaste, began to fulfil the office of Mediator. For even though he was not yet clothed with flesh, he came down, so to speak, as an intermediary, in order to approach believers more intimately. Therefore this closer intercourse gave him the name of angel. Meanwhile what was his he retained, that as God he might be of ineffable glory. Calvin Institutes XIII p133