"We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts." (2 Peter 1:19)
Sometimes when we need insight into a problem, we try to get it by focusing our attention on that problem. We study it. We ponder it. We examine it from every angle. But the Apostle Peter gives us a different approach. He says we should take heed (or focus our attention) to the written Word of God until the answer to that problem dawns on us through the light of revelation.
We use the term "seeing the light" in natural things all of the time. We say, "Have you seen the light on that yet?" meaning, "Do you have insight into that situation?" Well, the entrance of God's Word into our hearts brings spiritual light (Ps. 119:130). It brings the insight we need.
Have you ever been in a dark room and tried to find your way out? Or lost outside in the night? What is the first thing you look for in these situations? Light!
It could be coming from under the door or shimmering from a lamp in a house far off. But either way, you head straight for it. You don't waste your time studying the darkness. You don't focus your attention on that. You fix your eyes on the light because you know its brightness will drive out the confusion of the darkness and orient you to your surroundings.
If you need insight on some problem or situation you're facing, pay attention to the Word. Head for the Light and the answer you need will dawn on you.