Hate cannot drive out hate, only love can do that. When I read the following quote by Martin Luther King Jr., it made me think that the darkness that he is speaking of is evil. The only solution to get pass the darkness is through the light. In other words, we as humans cannot be passed evil until love is practiced which are the bases of every heart. Until then, peace and harmony is something that our world is continuing to strive for.
Love is universal.
There is a light that shines beyond all things on earth, beyond us all, beyond the heavens, beyond the highest, the very highest heavens. This is the light that shines in our heart. The light that shines in our hearts is what we should let guide us in our everyday decision making. If our hearts had unconditional love, then there would not be any space left for hate or evil. Love in my opinion is more powerful than any hatred.