What does it mean to be human? This book explores that age-old question and provides a basis for rethinking the nature of all living beings. The author argues that the existentialist notion of being-in-the-world is a radical reassessment of what it is to be a human being but it that it has not adequately established the natural spirituality of human existence. The reader will consider that being-in-the-world, seeing-the-world, and understanding-the-world and acting-in-and-upon-the-world are not merely physical events. The living body is ensouled, and because it is ensouled it makes the surrounding world perceptually and intelligibly present, and is able to transform the world in accordance with its desires for good and for ill. This argument is reconciled with scientific knowledge, rigorous philosophical argument, and with ordinary human experience. This Is My Body will leave you with a new understanding of yourself and your existence in the world as well as the nature of all living beings.