All things must exist in balance in order for anything to be its mirror.  Shadows exist to mirror light.  When we become resistant or afraid to look at the things in ourselves that we resist or detest, we create more shadows:  fear, despair, sadness, anger.  It is like running from the dragon.  The dragon is always breathing hot fire down our necks.  The more we resist, stabbing with our sword of denial, the more baby dragons appear.  For what we resist, persists!