Acts 7:55-56 But he, full of the Holy Spirit, gazed into heaven and saw the glory of God, and Jesus standing at the right hand of God. But he, full of the Holy Spirit, gazed into heaven and saw the glory of God, and Jesus standing at the right hand of God. And he said, “Behold, I see the heavens opened, and the Son of Man standing at the right hand of God.”
Heb. 10:12 But when Christ had offered for all time a single sacrifice for sins, he sat down at the right hand of God…
St. Ambrose of Milan ca. 338-397
Make yourselves then to appear worthy that Christ should be in your midst. For where peace is, there is Christ, for Christ is Peace; and where righteousness is, there is Christ, for Christ is Righteousness. Let Him be in the midst of you, that you may see Him, lest it be said to you also:
There stands One in the midst of you, Whom you see not. Jn. 1:26 The Jews saw not Him in Whom they believed not; we look upon Him by devotion, and behold Him by faith.
Let Him therefore stand in your midst, that the heavens, which declare the glory of God, may be opened to you, that you may do His will, and work His works. He who sees Jesus, to him are the heavens opened as they were opened to Stephen, when he said:
Behold I see the heavens opened and Jesus standing at the right hand of God. Acts 7:56 Jesus was standing as his advocate, He was standing as though anxious, that He might help His athlete Stephen in his conflict, He was standing as though ready to crown His martyr.
Let Him then be standing for you, that you may not be afraid of Him sitting; for when sitting He judges, as Daniel says:
The thrones were placed, and the books were opened, and the Ancient of days did sit. Dan. 7:9 But in the eighty-first [second] Psalm it is written:
God stood in the congregation of gods, and decides among the gods. So then when He sits He judges, when He stands He decides, and He judges concerning the imperfect, but decides among the gods. Let Him stand for you as a defender, as a good shepherd, lest the fierce wolves assault you. (Letter 63)