You have no doubt heard someone say light is associated with that which is good. When something is exposed is said to be brought to light. In the same manner darkness is said to be associated with that which is bad or concealed.
Perhaps the idea comes from the Bible, where light and darkness are compared and contrasted from its opening verses all the way through to the closing chapter. The fourth verse of the very first book reads:
“God saw that the light was good, and he separated the light from the darkness.” Genesis 1:4 NIV
I unknowingly participated in an experiment the other day contrasting the difference between light and darkness. I noticed the direction I am walking matters (towards the light or away from it) in a darkened room. When walking away from the light in a large room filled with obstacles, I noticed those pitfalls became harder to see and navigate around the further I got from a source of light. I also learned the opposite is true when I walked towards the source of light. The closer I got the light the more defined obstacles became and easier to avoid.
“Your word is a lamp for my feet, a light on my path.” Psalm 119:105 NLT
I put the contrast between light and darkness to the test every time venture out for an evening workout. Carrying a light and wearing reflective clothing when I’m walking in the dark lights my path, but it also keeps me safe.