"Christ is the visible image of the invisible God." (Col 1:15).
The Son has always been there to reveal the Father; whenever God is revealed it is Christ. In whatever way God manifest it is Christ, even before anything was created Christ has always been there to make God visible.
"who alone has immortality, who dwells in unapproachable light, whom no one has ever seen or can see." (1Tim 6:16).
No one can approach God, not even the angels. God makes Himself visible through the Son. Whenever they look and see God, what they are actually looking at is the Son. This is the role of the Son in the Godhead. Even while Jesus was on earth the Son was still in Heaven making God visible.
We must understand that God is omnipresent, he is everywhere at the same time, and Christ is God. When the Israelites were waiting for the Messiah there weren't waiting for "the Son of God", they were waiting for God Himself. But God cannot manifest (make himself visible) excerpt through the Son. The Israelites didn't have the theology of the trinity, all they know is that God will manifest (create an avatar of Himself) and deliver them, ruling them Himself.
For He is their king, he has always been their king, we can see all through the Old Testament. God has always been their king but when they asked for a have leader He gave them men to represent Him as king. But they know that someday He would come and rule by himself. They did not know that any such thing as "the Son" exist, it was God coming to rule His people. But whenever he makes Himself visible it is the Son. When He makes Himself visible by His word, that word is the Son (John 1-14).
"Christ is the power of God and the wisdom of God." (1Cor 1:24).
"He is the sole expression of the glory of God [the Light-being, the out-raying or radiance of the divine]," (Heb 1:3).
Whenever God makes Himself visible by his power, it is the Son. When he makes Himself visible by His glory, it is the Son. Even when the angels look and see God, it is the Son they see. In whatever way God makes Himself visible, whatever it may be, that thing is Christ. And when God decided to make Himself visible in the flesh, it is also Christ.
Christ is not just that flesh, he is also that light, that glory, the power, the word and every other thing that manifests God. Christ is not limited to one place, he is omnipresent, and he is everywhere revealing God, making God visible. Two thousand years ago he was on the earth making God visible in the flesh, but at the same time he was also in heaven making God visible to the angels, and at the same time whenever God speaks it is still Christ making God visible as the word. He is everywhere making the invisible God visible.
God Himself is invisible, He is unapproachable, He is too supreme, too great for anyone to behold, whether angel or man. Just as the natural eyes cannot see the spiritual realm because it is too great for the natural eyes to see, so also is God too great for any eyes to see, whether natural or spirit. He is immensely great for any created thing to behold. This is the Creator, the very beginning of all existence, all realms all realities. He is a realm on His own, a reality too great for any to reach. This is where the Son comes in.
The Son is how this immensely supreme being makes Himself visible to all that he has created. This unapproachable and invisible God is now seen and approached because of the Son. The Son brings God to a level that He can be seen and approached by the created.
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