One of the greatest task of a Christian is to remain in fellowship. Here John is struggling with light and darkness concept to establish the realization of Fellowship. When somebody is hurt it requires a lot of love to, first, stop retaliating, bear the pain, be patient till the wound heals and always neglect the idea of storing vengeance. We somehow need to play the game of life with minimum injuries but it is not the same for everybody. Therefore every individual Christian has to discover himself and struggle to understand and accept others. This then I believe would help us from being blind and also would help us to move from darkness to light or experience the illumination in our Life.