John 12:41

(Hom. lxviii. 2) His glory means the vision of Him sitting on His lofty throne: I saw the Lord sitting upon a throne. Also I heard the voice of the Lord, saying, Whom shall I send, and who will go for us? (Is. 6:1)

(Tr. liii. 11) These things said Esaias, when he saw His glory, and spake of Him. He saw Him not really, but figuratively, in prophetic vision. Be not deceived by those who say that the Father is invisible, the Son visible, making the Son a creature. For in the form of God, in which He is equal to the Father, the Son also is invisible; though He took upon Him the form of a servant, that He might be seen by men. Before His incarnation too, He made Himself visible at times to human eyes; but visible through the medium of created matter, not visible as He is.

"These things said Isaiah, when he saw His glory, and spake of Him." What Isaiah saw, and how it refers to Christ the Lord, are to be read and learned in his book. For he saw Him, not as He is, but in some symbolical way to suit the form that the vision of the prophet had itself to assume. For Moses likewise saw Him, and yet we find him saying to Him whom he saw, "If I have found grace in Thy sight, show me now Thyself, that I may clearly see Thee;" for he saw Him not as He is. But the time when this shall yet be our experience, that same Saint John the Evangelist tells us in his Epistle: "Dearly beloved, [now] are we the sons of God; and it hath not yet become manifest what we shall be: because we know that, when He shall appear, we shall be like Him; for we shall see Him as He is." He might have said "for we shall see Him," without adding "as He is;" but because he knew that He was seen of some of the fathers and prophets, but not as He is, therefore after saying "we shall see Him," he added "as He is." And be not deceived, brethren, by any of those who assert that the Father is invisible, and the Son visible. This assertion is made by those who think that the latter is a creature, and whose understanding runs not in harmony with the words, "I and my Father one." Accordingly, as respects the form of God wherein He is equal with the Father, the Son also is invisible: but, in order to be seen of men, He assumed the form of a servant, and being made in the likeness of men, became visible to man. He showed Himself, therefore, even before His incarnation, to the eyes of men, as it pleased Him, in the creature-form at His command, but not as He is. Let us be purifying our hearts by faith, that we may be prepared for that ineffable and, so to speak, invisible vision. For "blessed are the pure in heart; for they shall see God."