Darkness is a much maligned being. Everyone praises the light, everyone advocates in the favour of light. Especially on the occasion of Diwali, the most common refrain begins with “Let there be light……”, as if we are living in the dark till now.
Importance of light is due to the darkness. In fact they follow each other. It is only for darkness, we admire the light. The truth is that we have been blessed to see only a very narrow spectrum of the reality. It is a very narrow window in comparison to the whole spectrum. We are not able to see beyond the infrared and ultraviolet region. Only a minuscule window is available for us. Birds and bees are better off than us in this regard. Bees for example can see in the ultraviolet region. Birds can see in the lower frequencies than infrared.
In fact, the visible is just an iceberg floating in the sea of hidden or darkness. Dark matter which is counterpart of the visible matter is many times bigger.
Darkness is absolutely necessary for shutting down the process visible inputs to our mind. It forces the humans to sleep and rejuvenate the brain by giving it the necessary respite. Receptors especially eyes & ears are always receiving and feeding the information to the brain. They keep the brain busy. So the darkness helps to shut down these receptors periodically.
Everything exists in pairs in the universe. One is complementary to the other. Matter has antimatter, electron has positron, vice has virtue, Ravana has Rama, Yin has Yang, eggs have sperms, night has day as their complements. Think if everyone were good or everyone were bad, the evolution or progress will come to a grinding halt. Humans thrive on the competition, dominating others is in their blood. If it were not true, life would be so boring. Species will not have to do anything for survival. No one will challenge others as everyone will be satisfied and have no aspiration.