I've linked to this book before.
It was given to me by a friend to help me with a person close to me, and makes what to me is a massively important point that I try always to bear in mind:
It is
not what the doctor/therapist thinks is going on that matters. It is what the person hearing the voices thinks that matters. The book details various case studies in which people who were deeply troubled by their voices reached very different conclusions about what was happening to them, and used those conclusions to help them to manage the voices. One found that Julian Jaynes's ideas about fractured consciousness made sense to her, several others thought that they were in contact with a spirit world and
liked that they had this contact.
That I might dispute the idea that the voices are messages from angels is neither here nor there if I am trying to help a person lead a better life with their voices. Certain versions of the medical model simply don't leave room for this kind of analysis as they have a preconceived idea of what 'mentally well' looks like.
In the 90s, I was involved in a group called Mad Pride, and this was one of their central themes -
Give us space to be 'mad', please. That's what we want.