Ezra Sullivan argues that the topic of habits is a golden thread that helps readers find their way through Thomas Aquinas’s extensive writings on morals. By describing the many kinds of habits we possess, and their widespread but often hidden effects in our lives, this book offers a new and unique reevaluation of many issues central to the moral life. It addresses childhood development, pagan virtue, akrasia, circumstances that limit free choice, how heroic virtue operates, and more. By seeing habits in general as a prism for understanding human action and its influences, Habits and Holiness provides a unique and appealing synthesis of Thomistic virtue theory, the contemporary science of habits, and best practices for eliminating bad habits and living good habits.