5 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.” 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.
Source: Letters (New Advent)