Because there is dark, we are aware of the light. There can only be beauty because we judge ugliness. There can not be hate if there is not love. We are human and in our human-ness there is duality in all things, when we are able to see that in all things there must be an opposite then we have increased our conciousness but when we realize there is no duality, that opposites are really one and the same and that there is only one-ness…..then we have found peace.