The bible eventually became an open book of self interpretation, that's why there are hundreds of Christian based sects in existence today.
Self interpretation is how these sects came to be such as the JWS, this sect was built and expanded by literature proliferation, where the leaders self interpreted the bible for themselves, which happen to involve a publishing house they owned and operated.
The model is such, create your own interpretation then coerce and lure in others to believe these unique interpretations, demean all other interpretations or doctrines and you have a structured organized religion ie, JWS