There was a man sent from God, whose name was John. This man came for a witness, to bear witness of the Light, that all through him might believe. He was not that Light, but was sent to bear witness to of that Light. That was the true Light which gives light to every man coming into the world.
The first paragraph makes my heart leap. The enormity of all that is said in those four sentences... Jesus is that Light. I know I've repeated this many times. Jesus is the Word. He was with God because He is God. Since God created all things that were made then Jesus was part of that also. Since God brought life to this world, Jesus did too...and He is the life. And the Light. Of the world. That anyone who believes (condition below) in this Light, because of anyone who witnesses of that Light, might have this life.
Condition? Spiritually we are dead to our sins and the Light exposes those things in the darkness (of our hearts), which is the first step to life in the Light, in Christ. This is probably the biggest obstacle because no one wants those things hidden in darkness exposed, or wants to admit that some of the things we do are sin.
Do you see? Jesus is the true Light which would love to give light to every man who has and will come into this world. He came for all mankind. He came as the Light to reveal Himself. He comes to bring life but it means admitting the sin we have so He can forgive us of it. Allow the Light into your life and that you too might become a witness of this Light.