Every time he speaks of himself you sense something missing, something not quite true. It's not that you doubt his sincerity - on the contrary, you know he's making every effort to be entirely forthright - it's just that you recognize that the self looks different viewed from inside. It's as though by putting himself in the spotlight he had blinded himself to his own shadow, to the audience of alternate personae watching from the wings. He tells you, honestly and in great detail, what he sees, but all the while what you really want to know is what's lurking there, behind his mind.
It's like the difference between the image of yourself you carry with you and your face in a photograph.