The bible was written by humans as was this series of books - (or 'received').
The information provided can be used and learned from - with confidence being built in it's usefulness. In my own case I healed my spine from what was basically disablement - in a way that could not be achieved in a different way or with 'medical professionals'.

We are spirits. Yes, discernment is key and that is part of the Right use of will too.