What conscious autosuggestion is
Coué’s argument is built on a single distinction: we each have a “conscious self” and an “unconscious self,” and it is the unconscious — which he equates with the imagination — that really runs the show. When the will and the imagination disagree, he insists, the imagination always wins. His illustrations are vivid and, a century on, still persuasive: a plank on the floor you can walk easily becomes impossible to cross when it is raised between two towers, not because your legs change but because you picture yourself falling; the harder an insomniac tries to sleep, the more wakeful they become.
From this he draws his method. Since suggestions from outside only work once the listener turns them into a suggestion of their own — what he calls autosuggestion — you may as well make those suggestions to yourself, deliberately. His instructions are famously simple: each morning and night, eyes closed, repeat twenty times, in a “monotonous” voice and counting on a knotted string, one sentence:
“Every day, in every respect, I am getting better and better.”
Crucially — and this matters for what the book is — Coué tells the practitioner to drop the trance altogether. “I am not going to try and put you to sleep as it is quite unnecessary,” runs his script; he explains that he “formerly… always tried to put my patient to sleep; but on discovering that it was not indispensable, I left off doing it.”
Is it really hypnosis?
It is fair to ask, and the honest answer is: this is the founding text of self-hypnosis, not of the clinical, therapist-induced kind. Coué himself wrote that “autosuggestion is nothing but hypnotism as I see it,” and his warm-up exercises — having a subject fall stiffly backwards, or lock their hands so tightly they cannot pull them apart — are the classic suggestibility tests still demonstrated in hypnosis today. But he deliberately removed the formal trance and the operator’s authority, leaving a waking, self-directed practice. That lineage runs directly to modern self-hypnosis and to autogenic training. So Coué belongs squarely in the hypnosis family — on the self-hypnosis branch — rather than in the clinic.
What the evidence says
Coué’s core mechanism has aged better than his promises.
The idea that focused expectation can change how the body feels and functions is no longer fringe; it is the territory of placebo and expectancy research. His most direct descendant, autogenic training, has a respectable evidence base: a meta-analysis of sixty controlled studies found medium-sized benefits for anxiety, mild-to-moderate depression and sleep problems (Stetter & Kupper, 2002). To the extent Coué’s routine is a gentle relaxation-and-self-suggestion practice, that is the company it keeps.
The trouble is the specific tool he sells. Repeating a flat positive statement is not reliably helpful, and can be counter-productive: in one well-known experiment, Coué-style positive self-statements left people with low self-esteem feeling worse, not better (Wood et al., 2009) — which is to say the affirmation may misfire for exactly the readers most likely to reach for it. Studies indicate the benefits of self-affirmation are real but context-dependent, not the universal solvent the book describes.
And the book does describe a universal solvent. Coué writes that “every illness… can yield to autosuggestion,” and that organic lesions “will get better from day to day and will soon be entirely healed.” There is no modern evidence for that, and presenting self-suggestion as a route to healing organic disease is exactly the kind of claim a reader today should treat with caution rather than trust. Where Coué stays close to mood, tension and confidence, he is on defensible ground; where he reaches for the body’s tissues, he is not.
Who it’s for
If you want to meet the origin of self-hypnosis in its author’s own words, and to try a calm, no-cost self-suggestion routine as a small daily habit, Self-Mastery is genuinely worth a couple of evenings — and you can read it free (see below). Treat the scripts as something to experiment with, not as medicine. If you are managing a diagnosed physical or mental-health condition, read it as history and a complement at most, and speak with a qualified clinician before changing anything you are doing.