Darkness is not knowing God and, even worse, not realizing that you are living for Satan. Darkness is confusion over goodness and evil; it is not really understanding that true goodness can only be inspired by God's grace. Darkness is looking at death with a big question mark or, more honestly, in complete fear. Light is the opposite. A person who stands in the light of Jesus and His revelation of God the Father knows God, flees the devil, loves good, hates evil. He know that he can face death, for in Christ he has already died and risen again, and that his death is but a continuation of the life he now has but far greater.
from "Gospel Motivation" by Robert J. Koester, Northwestern Publishing House, page 113.
