that which we have seen and heard we declare to you, that you also may have fellowship with us. Yes, and our fellowship is with the Father, and with his Son, Jesus Christ.

 (iv) It tells us of the guidance of God. It is one of the great functions of light to show the way. The road that is lit is the road that is plain. To say that God is light is to say that he offers his guidance for the footsteps of men. 