I don't know if this will make any sense to you or be helpful but I have found it comforting for myself as I struggle with good and evil.

Somewhere I read or heard, perhaps in a conversation about spirituality with my beloved Therapist that the Light in this universe is able to hold both light and dark sides where as the Dark only feeds on more darkness and is one sided and less than whole. Therefore those who want to journey towards wholeness, as one or with the help of alters, will have to deal with both light and dark things. Those stuck with the dark only will never be able to see anything but darkness.

So, I can accept that I have dark parts of my soul but that does not define who I am. I will not let it.