There are of lots of spiritual memes out there contending that “darkness is necessary for the light to shine bright” or “without darkness light cannot shine”, blah, blah, blah. 

Actually, as the nature of things would have it, there can be darkness without light. Look at space, black holes, and a room with no windows or a light source. That’s why our eyes adjust to seeing in the dark. Just saying. Instead, lets suppose this;

“Without the Darkness, we couldn’t appreciate the Light.”

There, less hippy/mystical and more practical advise. Namastè and junk.