Darkness cannot drive out darkness; only light can do that.
Hate cannot drive out hate; only love can do that.
Even a happy life cannot be without a measure of darkness, and the word happy would lose its meaning if it were not balanced by sadness. It is far better take things as they come along with patience and equanimity.
People are like stained - glass windows. They sparkle and shine when the sun is out, but when the darkness sets in, their true beauty is revealed only if there is a light from within.
So the darkness shall be the light, and the stillness the dancing.