Darkness and light are two concepts that clash and meet at the same time. The combination of the two are considered a form of hypocrisy or schizophrenia that many people enjoy.
Darkness isn't always a negative concept. It is vague and misunderstood.
Light isn't always positive. It is overestimated and adorned.
Both exist within the soul. Yet one can overcome the other, as in the fight between good and evil.