Light decays and loses speed, fading away, allowing things to slip back in to the embrace of calm darkness. One always gives way to the other so that they have a shared meaningful existance. After all, if light wasn't slowed down by the darkness, it wouldn't be visible at all... Light moving at full speed leaves behind no trace of its passing, touching nothing, moving through the universe as though it doesn't exist. Darkness is much the same... With out the awareness and concept of light, darkness holds no meaning. Only emptiness.

If only we as humans could be so blessed to learn to share space together.
A profound thought, Dread. I often find that pausing to think of the big universe, space, time, and light, puts all the day's trivial human conflict into context and can be profoundly therapeutic.