Reference

John 9

Jesus uses a man's physical blindness to display the works of God when He heals him. Jesus, the Light of the World, and during His earthly life, fully completed the work to save those in spiritual blindness. Those who are proudly 'seeing' and refuse to recognize their blindness, or who don't desire to be freed from it will continue to walk in darkness and their guilt remains. But because of God's great love, those who recognize their blindness and put their trust in Jesus, the light of the world, are rescued from their guilt, and no longer walk in darkness.