Machig Labdron, Mother of Chod

"In Feeding Your Demons, Lama Tsultrim explains the essence of Chod by stating that "The process of feeding our demons is a method for bringing our shadow into consciousness and accessing the treasures it holds rather than repressing it.” She also quotes Machig Labdron, on the inner nature of demons, a common theme in Tibetan Buddhist literature:

"As long as there is attachment to ego, there are demons.
When there is no more attachment to ego, 

There are no more demons either!""

http://www.bellaonline.com/articles/art67742.asp