“For with You is the fountain of life; In Your light we see light.” – Psalm 36:9
C. S. Lewis said, “I believe in Christianity as I believe that the sun has risen: not only because I see it, but because by it I see everything else.”
It is by the light of Jesus (the true Light, John 1:9) that we see all light.
Without this light, we are, of course, completely in the dark.