I'd like to share with you the story of Ken Norton against Ali
https://www.thesportsman.com/features/ken-norton-the-former-us-marine-who-used-a-self-help-book-to-beat-ali
Mario
Good story . . .
Napoleon Hill's book was one of my staples back in the 50's, plus Émile Coué . . . and then I collided with a guy named Hubbard :-X