first off, I don't know much about the cult Scientology has presumably become, years after Hubbard began churning out his theoretical-psychological books. Despite my awareness that there ARE sketchy details, I was delighted to find that this book, perhaps unique for Hubbard(?), was a relatively simple treatise that hardly maintained anything ridiculous. There was 1 point I cringed when a non germ-theory of disease was proposed, but I insist that the claim is less arrogant than it sounds. In my own language (taking influence from Timothy Leary's work & Ken Wilber's model), Hubbard says that the potentially integrated, healthy, advanced human personality is inhibited/prevented by what he calls "engrams". Engrams are what Leary would call imprints on the lower circuits of consciousness. Unconscious behaviour habits, robotic emotional responses, SLEEP. Lower chakras that are in major tension, energy not circulating upwards. In Wilber's terms, these are the prepersonal pathologies that prevent healthy integration of the personality (preventing higher development to vision-logic or 2nd tier; this is what I think Hubbard refers to as the Optimum). Dianetics is then his claim of a science capable of healing these pathologies, allowing development, energizing the expansion of moral-cognitive development. In theory, this is a profound work for the 50s. He confirms what Grof would later see in over a thousand psychedelic sessions: pre-natal, perinatal experiences. He acknowledges the unity of mind & body, hence the causal efficacy of the mind ON the body (this is perhaps the arrogant over emphasis in the work; that strong engrams are the ONLY factor needed to treat disease). This book shows no actual evidence, just testimony. All in all, from this book I gain a respect for Hubbard's passion for healing the psychic damage humanity harbours, deep in the "subconscious". Hubbard discovered a way to crack this so called "unconscious" open and examine what came pouring out. For that, surely a pioneer researcher. The inflexible conclusions are the irksome aspect: perhaps Scientology's pathology is the inability to think beyond Hubbard.