Descartes is most often thought of as introducing a total separation of mind and body. But he also acknowledged the intimate union between them, and in his later writings he concentrated on understanding this aspect of human nature. The Passions of the Soul is his greatest contribution to this debate. It contains a profound discussion of the workings of the emotions and of their place in human life - a subject that increasingly engages the interest of philosophers and intellectual and cultural historians. It also sets out a view of ethics that has been seen as a radical reorientation of moral philosophy. This volume also includes both sides of the correspondence with Princess Elisabeth of Bohemia, one of Descartes's keenest disciples and shrewdest critics, which played a crucial role in the genesis of The Passions, as well as the first part of The Principles of Philosophy, which sets out the key positions of Descartes's philosophical system.--