"Reading Stephen King's book, On Writing, was like being cornered and forced to have a long, drawn out mental enema"

This quote is a funny means of expressing exactly how Mary Garden felt after reviewing Stephen King's publication, On Writing. She is suggesting that the book was so insightful and also thought-provoking that it seemed like a psychological cleaning. It was like being caught as well as compelled to meditate and also critically about the craft of writing. The quote implies that guide was so extreme that it felt like a long, extracted mental injection, which is a metaphor for a deep and also comprehensive cleaning. Mary Garden is recommending that the book was so powerful that it compelled her to think deeply and critically regarding the craft of creating, which it was a cleansing experience. Finally, Mary Garden is expressing her recognition for Stephen King's publication, On Writing, and also just how it was an emotionally revitalizing experience.