Charles Ellicott Commentary John 12:41

"These things said Isaiah, because he saw his glory; and he spake of him." — John 12:41 (ASV)

These things said Esaias, when he saw his glory.—The better text is, . . . because he saw His glory. (Compare Note on the reading in John 12:17.) The result of seeing His glory was that he spoke of Him. This is St. John’s interpretation of the prophecy.

Isaiah himself tells us, “I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple” (John 6:1).

But no man has seen God at any time. The Word is the express image of His Person. This glory was of the pre-incarnate Word, who was in the beginning with God, and was God.