"Supreme Personality: Fun in Living. A Doubt, Fear, and Worry Cure" by Croft is a self-help book likely written in the early 20th century. The book focuses on the theme of self-empowerment, encouraging readers to overcome doubts, fears, and worries. It presents a framework for achieving a fulfilling and joyful life through mental discipline, positive thinking, and practical techniques aimed at personal transformation. In this book, Croft presents a series of lessons that guide readers toward mastering their thoughts and bodies in order to achieve supreme health, vitality, and success. Each lesson expl