That kind of thing is the basis of a lot of crazy orthodoxies. For example Jehovah's Witnesses are often encouraged not to read the bible, but to read JW bibles

That kind of thing is the basis of a lot of crazy orthodoxies. For example Jehovah's Witnesses are often encouraged not to read the bible, but to read JW bibles or writings instead. It's incredibly easy to control people when you make insularity a virtue, and they buy into it.