Darkness occurs when there is a lack of light. But the darkness of the heart isn’t the same as the darkness of night. Learn the difference and let the night be dark, but the heart be of light.
Can you see what is beyond the darkness of the world of thought, into the realm of the thoughtless, where the light shines. This light is the silence that surrounds us all the time, but because of the world of thought, which is noise, its not noticed. There are two kinds of darkness that fill life, one is the darkness that is needed for rest and for things to arise (silence). The other is the darkness that blocks out our inner light, this is the darkness of the heart, the thought realm, the world of noise. This darkness blinds us from the love that is in our heart. In this darkness is what can be called evil, but only in the sense that this evil in and of itself is the darkness only because it blocks out the light. There are many ways to block the light, the tools used by darkness are greed, envy, pride, jealousy, hate and delusion to name a few. There is only one way to see the light, but it is more powerful then all the tools combined of the darkness. Light will always overtake darkness as long as there is a source for the light. And the source to our light is love.
How the light is allowed to shine is by removing the darkness. Its like when entering a dark room, all you need to do is turn on the light and the darkness disappears. It can not sustain itself where there is light. The two can not coexist at the same time. There will always be one or the other. So when its learned what causes ones darkness, as these things are removed the light will shine more and more. Eventually there is only light in the sense of bringing love into the world.
The light of the world is the love of the world, and when this light shines darkness can not prevail. So when the things that block the light are removed, the things that block love are removed and when this occurs the only thing that will be left is love, which in turn will make us a light unto a world that has way to much darkness. So be a light unto yourself and you will be a light to all beings and if they want to remain in darkness that will be up to them, but at least you are giving them a source of light, which is the love that is in your heart.