"The Science of Being Well" by Wallace D. Wattles is a self-help book written in the early 20th century. The work focuses on the principles of health and wellness, outlining practical guidelines for achieving perfect health through mental and physical practices. It emphasizes the power of thought in relation to health, proposing that one's mindset can significantly influence their physical state. The opening of the book establishes Wattles' goal to provide readers with a practical guide to health rather than a theoretical discussion. He introduces a universal Principle of Life that is fundamental to health and healing, asserting that true health arises from a definitive state of mind and the "natural performance of function." By sharing his insights and experiences, Wattles encourages readers to consciously engage in positive thinking and actions aligned with the goal of achieving and maintaining their health. The chapter sets the tone for a holistic approach, detailing how one's beliefs and methods directly correlate with their health outcomes. (This is an automatically generated summary.)