https://en.wikipedia.org/wiki/Thought_disorder
as did Eugen Bleuler. I have a friend who is schizophrenic whose speech hardly makes sense and she is always calling people on the phone and carrying on nonsensical conversations. Somehow the general public is hung up on ‘hearing voices’ but I have never once heard a voice but under stress I (schizotypal) did once spend about six months under the influence of a ‘system of delusions’ yet stayed mostly functional, kept working, and managed to avoid getting in serious trouble.
I think it is quite ordinary also for people to have a dialogue with an ‘invisible friend’ or believe that they ‘talk to God’ when they pray, the auditory hallucinations of schizophrenia seem to be something like you have a thought that you don’t think is your thought but somebody else talking, notably schizophrenics often believe that somebody is putting thoughts into them or taking thoughts out of them, see