Jn.12:41 – These things Isaiah said because he saw His glory, and he spoke about Him.
John the Apostle said that Isaiah had seen the glory of God in his encounter in he temple. You could say that this was like Paul’s encounter with Jesus on the road to Damascus. Isaiah saw the Lord high and lifted up on His throne. Paul obviously preached the mystery of the gospel like no one else. His revelation of redemption came from his personal encounter with the Lord. In the same way, Isaiah spoke of the things he saw and heard out of his encounter with the Lord. Isaiah spoke of the eternal nature of Christ, His virgin birth, His life and ministry, and also gave an amazing description of His death including the message of redemption. He spoke of the sons and daughters purchased by Christ as signs and wonders, he spoke of His millennial reign, and the salvation of the gentiles. Here is how Eusebius of Caesarea saw Isaiah’s revelation.
“In approaching the account of his coming to humanity, the prophecy before us tells first of his divine kingdom, in which it says that the prophet saw him sitting on a throne high and exalted. This is that throne that is mentioned in the psalm of the Beloved. … John the Evangelist supports my interpretation of this passage, when he quotes the words of Isaiah, where it is said, “For this people’s heart has become fat, and their ears are dull of hearing, and they have closed their eyes,” referring them to Christ, saying, “This is what Isaiah said when he saw his glory and bore witness of him.” The prophet then seeing our Savior sitting on his Father’s throne in the divine and glorious kingdom, and moved by the Holy Spirit and being about to describe next his coming among humanity and his birth of a Virgin, foretells that his knowledge and praise would be over all the earth.”
Isaiah seeing the Lord on His throne was a glimpse into His present day ministry as our eternal, heavenly high priest. While reading this passage, I began to look at it as a personal word from the Lord. When I see His glory I speak with a new authority. John himself said “What we have seen and heard we proclaim to you also.” This is the power of our testimony; we declare what we know by encounter, not what we hear others say.