Joseph Murphy's book, Think Yourself Rich, which offers practical techniques for achieving wealth and happiness.  The core concept is that by utilizing the power of the subconscious mind and employing specific mental and spiritual practices, including prayer and visualization, individuals can manifest their desires, including financial prosperity. The book provides numerous case studies illustrating the success of this approach across diverse backgrounds and religious beliefs. Techniques involve positive affirmations, visualizations of desired outcomes, and releasing anxieties about achieving one's goals. The author emphasizes the importance of a positive mindset and trust in one's subconscious capabilities to attract abundance.