Gregory the Great — on Ezek 1:28 (Homilies on Ezekiel, Book 1, Homily 8)

“"This was the appearance of the splendor all around, and this was the vision of the likeness of the glory of the Lord." And when the entire mystical vision was completed, he adds: "This was the appearance of the splendor round about." For, gazing upon what the grace of the Holy Spirit does throughout the entire world, he says: "This was the appearance of the splendor round about." But wishing to consider what glory of the same Holy Spirit remains within, yet unable to see it as it truly is, he adds: "And this was the vision of the likeness of the glory of the Lord." For he does not say "the vision of the glory," but "of the likeness of the glory," so that it might be shown that however much the human mind has stretched itself with effort, even if it now restrains the phantasms of bodily images from its thought, even if it now removes all circumscribed spirits from the eyes of the heart, nevertheless while still placed in mortal flesh it is unable to see the glory of God as it is. But whatever of it shines in the mind is a likeness, and not the thing itself. Hence that preacher who had been caught up to the third heaven also said: "Now we see through a mirror in an enigma." In this matter, a question arises for us that should not be overlooked: how did John the Evangelist, when he had described the faithlessness of the Jews toward the miracles of our Redeemer even from prophetic words, add, saying: "These things Isaiah said when he saw his glory, and spoke of him." And if Ezekiel saw not glory, but the likeness of glory, what does it mean that the one is described as having seen the likeness of glory, and the other as having seen his glory? But since John the Evangelist first narrated the miracles of our Redeemer, and afterward added the unbelief of the Jews, he makes clear that Isaiah saw this glory of our same Redeemer which appeared in the world. For everything marvelous that is done divinely on earth is the glory of almighty God, and his glory is seen in all things that are done. Therefore Isaiah saw his glory on earth; but Ezekiel could not see his glory in heaven as it is, because his glory is one thing in created things, and another in himself. Therefore this glory of his which is in things can be seen, but that which is in himself cannot be seen now except through a likeness.”