Wallace D. Wattles's 'The Science of Wallace D. Wattles: Complete Trilogy' is a paramount collection that encapsulates the core tenets of the New Thought movement, bridging the gaps between metaphysics and practical self-improvement. It comprises three seminal works: 'The Science of Getting Rich', which posits the concept of wealth creation through mental transformation; 'The Science of Being Well', a manual focusing on health maximization through mental and physical harmony; and 'The Science of Being Great', which advocates for personal excellence achieved through positive thinking and the intrinsic power of one's mindset. These texts, endowed with a forthright and prescriptive literary style, are grounded in the philosophical context of their time, echoing the principles found in the works of Hegel and Emerson. Wattles, an American author and a proponent of the New Thought philosophy, remains an elusive figure in personal history yet his ideas continue to reverberate through the self-help genre. His conviction that personal development and material success were inextricably tied to a particular understanding of the universe led him to craft these guides, designed to unlock the reader's potential. His experiences, including his transformative Chicago lectures, are reflected in his advocacy for the monistic theory of the cosmosa fundamental belief that everything is connected and that our thoughts have the power to shape our reality. Recommended for seekers of personal development and financial betterment, this trilogy serves both as a historical artifact of early 20th-century American self-help literature and a still-relevant guide for contemporary readers. Its principles, centred on personal power and the law of attraction, offer valuable insight to anyone looking to elevate their state of being across the spectrums of wealth, health, and personal greatness. Wattles's works beckon to those who dare to reimagine their potential and unlock the secrets of a fulfilling life.