The baby born in a manger in Bethlehem is the same King who indwells us in St. Teresa of Avila's center mansion and the same King who will come again in glory as the King of Kings and Lord of Lords of Revelation. It is awe-inspiring. Pseudo-Dionysius caught that joy in holiness and royalty and dominion in connection with the descriptions we use for God.
All of the words we use to describe God are inadequate. Dionysius grasps that fully and says, "all things that have Being are surpassed by Him that is beyond them all, and all the Participants and all the Very Qualities are surpassed by the Unparticipated Creator." All of the qualities we see in God are surpassed by God.
Earlier in The Divine Names, Pseudo-Dionysius commented that to celebrate God, we must "draw upon the whole creation." Conscious that God is "beyond the grasp" of all reason , knowledge, mind and being, that God is unutterable and nameless, he tries to describe God as well as he can from the names we find for Him in Scripture.
King of Kings, Lord of Lords, King of the nations (or of the Gentiles), the only joy of every human heart, the Keystone of the mighty arch of man . . . the names for the Messiah in the O Antiphons, drawn from Old Testament prophecies, also seek to describe what is beyond our grasp. God who is unutterable and nameless was born in human flessh to be our savior.