If we see any light, which is almost every moment of our lives, we are seeing a representation of Jesus Christ as creator, healer, and redeemer. The truth that Jesus is the light of the world is there all the time for us to see.
Darkness disappears when light arrives. Light does not appear because darkness has been removed. Darkness is always at the mercy of light. It is not we who must remove our darkness to make room for the Light. It is the light and life of Jesus which ousts our sin.