Absolutely nothing. If you start hallucinating, such as seeing imaginary things or thinking an "imaginary friend" is real -- maybe you should talk to yourself a little less, you know what I mean? But all together, there really is nothing wrong with talking to yourself.
I would rather say that if the person talks about how intelligent they are then i for an adult call it conceded.
He is just learning to identify himself as a person. It is part of a learning process.
He talks RP, has no humor and is very prude. Terribly wrong clichees. Sage.
First, are you sure that he's wrong and you're right. Then explain it nicely and try to lead the person to understand by himself.
A 'schizophrenic' -person with schizophrenia (mental disease). The person hears non existing voices and has hallucinations, to which they respond by talking out loud
There was an episode of House where the titular doctor made the distinction with respect to a patient who was talking to her mother, along the lines of (paraphrased somewhat):"If she talks to someone who's not there, she's hallucinating. If she talks to someone who's not there and has been dead for twenty years, she's delusional."
"He" is a subject. "Himself" is an object. Example: he talks to himself.
The cast of Fantastic Talks - 2008 includes: Roger Corman as himself Ray Harryhausen as himself Neil Marshall as himself Tom Shankland as himself
the person who talks in ones sleep is a Somniloquy.
A person who talks less in Hindi can be referred to as "chup" or "khamosh."
Soliloquy
There is no verse in the Bible that says that cremation is wrong.