Cosmas Indicopleustes, on Ps 109:1

“The Lord said to my Lord: Sit thou at my right hand: Until I make thy enemies thy footstool.”

“as the Lord himself testified when he addressed the Jews in these words: How then does David in the spirit call him Lord, saying: The Lord said unto my Lord, sit thou on my right hand till I put thy enemies underneath thy feet; if David then calleth him Lord, how is he his son? The expression, his Lord, clearly indicates that he was God, and that other, sit thou at my right hand, is clearly suited to his humanity. For, the word sit he said to him who was not sitting. But Deity is established in its own blessedness, and honour and glory, and is neither conceded by one who is greater to one who is less, nor is one who is less invited to assume it. But the humanity of Christ is, by the Deity which is inseparably united, invited in the words: Sit thou at my right hand, that is, in my dignity—for God being uncircumscribed has neither right hand nor left. But he says this to his humanity, sit in my dignity—that is, in my person, as the image of God, shown to all the world.”

Imported from an open dataset — not yet checked against the printed edition.