Émile Coué genuinely seems to have wanted to help people by teaching them how to plant helpful directives in their subconscious minds. Whether he was effective is something that's still debated. 

Research:

• Baldwin, J. Mark, et al. “A Disclaimer.” Science, vol. 12, no. 309, 1900, pp. 850–850. JSTOR, http://www.jstor.org/stable/1629542
• Baudouin, Charles. “Émile Coué and His Life’s Work.” American Library Service. New York. 1923. https://digirepo.nlm.nih.gov/ext/dw/55330740R/PDF/55330740R.pdf
• Baudouin, Charles. “Suggestion and Autosuggestion.” New York. Dodd, Mead and Company, 1921. https://dn720207.ca.archive.org/0/items/suggestionauto00bauduoft/suggestionauto00bauduoft.pdf
• Britannica Editors. "Émile Coué". Encyclopedia Britannica, 22 Feb. 2026, https://www.britannica.com/biography/Emile-Coué
• “Coue, After Goodby Lecture, Flees City.” Boston Globe. January 31, 1923. https://www.newspapers.com/image/430295545/
• “Coue Explains How to Use Auto-Suggestion.” Boston Globe. January 7, 1923. https://www.newspapers.com/image/430953338/?match=1&terms=Coue
• COUÉ, EMILE. “SELF MASTERY THROUGH CONSCIOUS AUTOSUGGESTION.” AMERICAN LIBRARY SERVICE PUBLISHERS. NEW YORK. 1922. https://www.gutenberg.org/files/27203/27203-h/27203-h.htm
• “Delirium Tremens.” Cleveland Clinic. June 5, 2023. https://my.clevelandclinic.org/health/diseases/25052-delirium-tremens
• “EMILE COUÉ DEAD; A MENTAL HEALER; Many Made Well by Saying ‘Every Day, in Every Way, I'm Growing Better and Better.’” New York Times. July 3, 1926. https://www.nytimes.com/1926/07/03/archives/emile-Coué-dead-a-mental-healer-many-made-well-by-saying-every-day.html
• Heid, Markham. “Is Hypnosis Real? Here’s What Science Says.” Time. March 2, 2023. https://time.com/5380312/is-hypnosis-real-science/
• Myga, Kasia A et al. “Autosuggestion: a cognitive process that empowers your brain?.” Experimental brain research 240,2 (2022): 381-394. doi:10.1007/s00221-021-06265-8
• Neal, E. Virgil, ed. “Hypnotism and hypnotic suggestion. A scientific treatise on the uses and possibilities of hypnotism, suggestion and allied phenomena.” New York State Publishing Company. Rochester, NY. 1906. https://archive.org/details/hypnotismhypnoti00roch/page/n9/mode/1up
• “Pliny 1813 Years Ahead of Coue … “ Boston Globe. January 30, 1923. https://www.newspapers.com/image/430295455/?match=1&terms=Coue
• Rapp, Dean R. “‘Better and Better—’ Couéism as a Psychological Craze of the Twenties in England.” Studies in Popular Culture, vol. 10, no. 2, 1987, pp. 17–36. JSTOR, http://www.jstor.org/stable/23413989
• Sage, X. Lamotte. “Hypnotism As It Is: A Book for Everybody.” New York State Publishing Company. Rochester, NY. 1900. Accessed online: https://upload.wikimedia.org/wikipedia/commons/5/5b/Hypnotism_as_it_is%3B_a_book_for_everybody_%28IA_hypnotismasitisb00sage%29.pdf
• Sari, N. K. et al.“The role of autosuggestion in geriatric patients’ quality of life: a study on psycho-neuro-endocrine-immunology pathway.” Social Neuroscience, 12(5), pp. 551–559. 2017. doi: 10.1080/17470919.2016.1196243
• Schlamann, Marc et al. “Autogenic training alters cerebral activation patterns in fMRI.” The International journal of clinical and experimental hypnosis 58,4 (2010): 444-56. doi:10.1080/00207144.2010.499347
• Whiteside, Thomas. “Better and Better.” The New Yorker. May 9, 1953. https://www.newyorker.com/magazine/1953/05/16/better-and-better
• Yeates, Lindsay B. “Émile Coué and his Method (I): The Chemist of Thought and Human Action.” Australian Journal of Clinical Hypnotherapy & Hypnosis, Volume 38, No.1, (Autumn 2016), pp.3-27. https://www.researchgate.net/publication/374753633_Emile_Coue_and_his_Method_I_The_Chemist_of_Thought_and_Human_Action