The central subject of 1 John
“This is the message we have heard from him and declare to you: God is light; in him there is no darkness at all.” 1 John 1:5, NIV. John assures us that the apostles heard from Jesus that God is light. God, who is light, became the man here on the earth so that the humankind could see who He is. Jesus Christ is the man who fully revealed to the world who God is. “When Jesus spoke again to the people he said, ‘I am light of the world. Whoever follows me will never walk in darkness, but will have the light of life.'” John 8:12, NIV. Jesus is the “Emmanuel,” God with us. God is light of life and, therefore, the “light of life” is with us.
John proclaims the overwhelming truth that Jesus, the Messiah, is, in fact, the light of light sent by the Father to the dying world. Jesus, the light, made it clear how much darkness did the Satan bring into the world. The actual knowledge of God among the humans was reduced to zero, and the humankind was on the brink of eternal death. However, God, because He loved the helpless sinners, sent His Son to illuminate the dark world, and bring into the world the actual knowledge of God. “’For God did not send his Son into the world to condemn the world, but to save the world through him.’” John 3:17, NIV.
The apostolic eyewitness is clear and compelling. Jesus is whom He said who He is – the Savior of the world. The apostolic eyewitness assures us that if we are in Christ, we walk in the light and thus, we have the eternal life here and now. However, if we refuse to walk in the light, we remain condemned to eternal death. See John 3:18.