What is the theme in The Quiet Room: A Journey Out of the Torment of Madness by Lori Schiller?

The Quiet Room has a number of themes, some of which run deep into a number of general, abstract issues. But there is a theme closer to the surface of the book and that is the theme of the Voices. The Voices are characters in the book and the constant auditory hallucination caused by Lori's schizophrenia. They often tell her to kill herself and sometimes take over her life and cause violent outbursts and lead Lori to attempt suicide and use cocaine.