I heard one of the best quotes the other day...
"From the beginning destiny was foreshadowed, light was separated from darkness."
What a profound statement this was to me. In every awesome work that God performs, there can always be a simple object lesson taken away from it.
So what is dark in your life right now? Is it a bad relationship? Are you spending more time on things that will pass away rather than things of eternal value?
Life is full of distractions. However, we should keep in mind the scripture texts that say, "he who knows what's right and does not do it, to him it's counted as sin (James 4:17, paraphrased). The dark areas of our lives won't always be pornography, other addictions, inappropriate intentions or actions with the opposite sex; or things of that nature.
The dark area could simply be the inability to take time out to have consistent alone time with God. When we accept Jesus as our Savior and King, we should be prepared to grow in our knowledge of him--fully embracing the God of our salvation.
Here are a few texts from 1 Peter that sum this subject up well:
"Like newborn infants, long for the pure spiritual milk, that by it you may grow up into salvation-- if indeed you have tasted that the Lord is good. But you are a chosen race, a royal priesthood, a holy nation, a people for his own possession, that you may proclaim the excellencies of him who called you out of darkness into his marvelous light." (1 Peter 2:2, 3, 9 ESV)