Believers demonstrate light, by their lives. The passage before us is very profound, but the actual structure and the heads of thought are clear and straightforward.
You have experienced regenerating power, the illumination of the Holy Spirit, the conviction of sin, the great need of the soul, so you have been drawn to repentance and faith, and light and life and understanding. Now you have to demonstrate to those around you that you have a new purpose in life, new standards to follow, a new destiny, and a new track.