9 Explain of what power you speak. Because here also, as is said, His power is mentioned, when the rod of His power is sent forth out of Sion, that He may be Ruler in the midst of His enemies. Of what power do you speak, “In the splendour of the saints”? “In the splendour,” he says, “of the saints.” He speaks of that power when the saints shall be in splendour; not when still carrying about their earthly flesh, and groaning in a mortal and corruptible body....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)