John admitted that he was not that Light but had come to bear witness of the Light, Jesus Christ. John was the forerunner of Jesus Christ, the one crying in the wilderness (Isaiah 40:3). John was simply the messenger; Jesus was the Message, the Word, the Son of God, the Messiah, the King.
Jesus has lit every person who has come into the world. This means that Jesus gave human, natural understanding, logic, and a mind that is higher than animal species. Man was made in the image of God with intelligence and reason that no other animal has. By this Light that lights every man who comes into the world, we can know that God exists; we can understand the higher moral order of humans over animals; we can reason between right and wrong; we can understand (without comprehending) that God is real and that God is the great Creator, since matter cannot be created from itself, and matter is not eternal.
God is the Great First Cause; outside of him there is no other cause that could bring about so complex an order as we see in our universe. With the Light that God (Jesus Christ) has given to each of us, every person becomes guilty before God: Romans 3:19 Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God.
This chapter goes on to say that he came unto his own (neuter) "his own things," and his own (masculine) "his own people" received him not; but I am happy that the verse ends like this: "but as many as received him, to them gave he power to become the sons of God."
If you are still in your sins and have never turned from them, repented and turned to Jesus, seeing him die on the cross to pay for all of your sins, and trusting him with your whole heart, I pray that God will shed more light upon your soul and show you your need of a Savior and open your heart and mind to the good news of the Gospel of God so that, believing in him alone, you may become a son of God and receive eternal life.
This new and granted light given by grace is a Light that is above man's comprehension. Notice 1 Tim. 6:16 Who only hath immortality, dwelling in the light which no man can approach unto; whom no man hath seen, nor can see: to whom be honour and power everlasting. Amen. This is why we are saved by grace through faith in Jesus Christ. This Light we cannot approach, but it may be given to us, and that is done by God himself through faith in his Son. He is the perfect Light. Through him the word of God becomes a lamp to our feet and a light unto our path.
Precious Word Divine
Shine into my inward part
To make me wholly Thine
Through grace within my heart.
Precious, holy Light
Bring salvation to my soul.
Give me radiant sight
And make me whole.