"Isaiah said this because he saw Jesus’ glory and spoke about him " (John 12:41)
On the first Easter Sunday evening the risen Jesus was explaining to two friends on the Emmaus Road ‘what was said in all the Scriptures concerning himself’ (Luke 24:27). Among many passages, he must certainly have referred seven hundred years back to the great vision of Isaiah chapter 6, that began: “In the year that King Uzziah died, I saw the Lord seated on a throne, high and exalted, and the train of his robe filled the temple.”
For the apostle John quotes words from Isaiah’s very vision in his twelfth chapter, and then comments, “Isaiah said this because he saw Jesus’ glory and spoke about him.’
The Pre-Incarnate Second Person of the Trinity! We read about God the Father in Scripture that ‘No man hath seen God at any time; the only begotten Son which is in the bosom of the Father, he hath declared him’ (John 1:18 KJV).
This explains those occasions when – in the Old Testament – the Lord God revealed Himself. It was not the Father who was being made visible, but the Son, who is eternally with Him.
Sometimes this Figure appears and speaks as ‘The Angel of the Lord’ (that is, ‘the Sent One’). As contrasted with AN angel of the Lord (who would be a created heavenly being), THE Angel of the Lord speaks and acts as only God can! Among the many references, check Genesis 22:11,12; Genesis 32;30; Exodus 3:2-6; Numbers 12:4-8; Judges 2:1-3; Judges 13:22.
Have we taken it in? Jesus did not begin half-way through history. He is from the Beginning.