A patient is 30 years old, works as a carpenter. Six months ago there appeared some behavioural changes: he got interested in philosophy, began writing a treatise on the purpose of his human existence, quitted his job, stopped caring about his children, went out carelessly dressed, heard "voices in his head"that guided his behaviour. The patient claimed sure that he was an Ambassador of God on Earth and was constantly feeling His influence. He is not critical about his disease. What diagnosis can be assumed?