Gregory the Great, on Acts 7:55

“But he, being full of the Holy Ghost, looking up steadfastly to heaven, saw the glory of God, and Jesus standing on the right hand of God. And he said: Behold, I see the heavens opened, and the Son of man standing on the right hand of God.”

“We must consider what it means that Mark says: He sits at the right hand of God; while Stephen says: I see the heavens opened, and the Son of man standing at the right hand of God. What does it mean that Mark testifies he is sitting, while Stephen testifies that he saw him standing? But you know, brothers, that sitting belongs to one who judges, while standing belongs to one who fights or helps. Therefore, because our Redeemer, having been taken up into heaven, both now judges all things and at the end comes as judge of all, Mark describes him as sitting after his assumption, because after the glory of his Ascension he will be seen as judge at the end. But Stephen, placed in the labor of struggle, saw him standing whom he had as helper, because in order that Stephen might overcome on earth the unbelief of his persecutors, his grace fought for him from heaven.”

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