Why wouldn't a man come to the light? Because his deeds would be reproved. Why would his deeds be reproved? Because his deeds are evil. Evil in comparison to what? The Spirit. People often compare their sins to each others and thereby determine that their sins are no worse that any others. It is a trick of false logic, it is like rotten apples comparing themselves to rotten apples that will never make the cut. Who then will make the cut? Only those that are born of Spirit.
To do truth is first and foremost to come to Jesus willing to have your deeds exposed. Most would falsely approach this as coming to Jesus to prove to him of your good deeds. The message here is that there are no good deeds to prove. All have fallen short. Our righteousness is but filthy rags. Good as they might be, our deeds have been devised and implemented by the flesh and not the Spirit remaining truthfully unborn from our souls. The flesh is either unaware of things of the Spirit or at completely at odds with the things that it is aware of.
John the Baptist paints a very illustrative picture of Jesus here. Jesus is described as being from above, He is God sent, speaking that which is from above, what He has seen above He testifies, He speaks the words of God, the Spirit is not limited in measure or proportion unto Him. He that believes exactly on this description of Jesus has eternal life.
Those who believe that Jesus was just a man like us who may have received a spiritual enlightenment full or partial, that He was the first of many, or that we can receive a similar enlightenment, have much to un-explain and dilute about this clear passage from John the Baptist. Jesus being the groom, being sent, testifying what He had seen long before incarnation, having unmeasured Spirit and the seal of testimony, all suggest that there is none other like unto Jesus and that He is not the first Christ of many nor partial.
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