Summary: I tried to explain what is involved John 1:1-18, which is introduction of who Jesus is, and its meaning, mainly why Jesus manifested in flesh reflects His glory, full of grace and truth.
John 1:1-18 Jesus came in the flesh
1. He is the Word, the Life, and the Light (1:1-4)
His nature as God:
A. Pre-Existence before the creation; His Eternity; He is not part of creation
B. Co-Existence with God; His Equality with God
C. Self-Existence: His Essence (In Him was life)
* about the nature of His existence, I learned from John McArthur’s sermon
2. Came the Word, the life and the Light
A. the Word came - “And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth.” (John 1:14)
B. The Life came - the life was manifested, and we have seen and testify and proclaim to you the eternal life, which was with the Father and was manifested to us (1 John 1:2)
C. The Light came – “There was the true Light which, coming into the world, enlightens every man.10 He was in the world, and the world was made through Him, and the world did not know Him.11 He came to His own, and those who were His own did not receive Him.” (1:9-11)
3. Even before He came, He was the Word, the Life, and the Light: He created the world and spoke as the Word, gave life as the Life and illuminated truth as the truth. Why did He have to come in flesh? Why did He have to go through as He went through as a human being, including dying on the cross as human being?
The Answer: to reveal God - “No one has seen God at any time; the only begotten God who is in the bosom of the Father, He has explained (revealed) Him.” (John 1:18)
4. God already spoke and revealed through His creation, the history of Israel – the Law, the tabernacle, the sacrifice, the festival, kings, prophets and priests. Then why was it necessary the only begotten God came to reveal (explain) God?
The Answer: “And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth.” (John 1:14)
5. Before Jesus came, God spoke to people in many ways (Heb 1:1), but all these communications and manifestations were like a copy or symbol or shadow of who was to come who would reflects God as He is. (Heb 8:5; 10:1) In other words, they reflected only partially grace and truth, but not completely as Jesus did. Until Jesus Christ came, no one would have known who God is. Then, why was it necessary the word became flesh to reflect “full of grace and truth.”?
The Answer:“The next day he saw Jesus coming to him and said, ""Behold, the Lamb of God who takes away the sin of the world!” (John 1:29)
“Therefore, since the children share in flesh and blood, He Himself likewise also partook of the same, that through death He might render powerless him who had the power of death, that is, the devil, and might free those who through fear of death were subject to slavery all their lives.” (Heb 2:14-15)
Jesus had to come in the flesh so that He could die on the cross.
Because of His death on the cross, God demonstrated His grace forgiving sinners.