This latest volume in the Spinoza by 2000 series contains papers from leading scholars on Book IV of the Ethics, including Garber, Della Roca, Brinker, Bove, and Yovell. In this volume, Spinoza's understanding of the relation between reason and passion and the nature of human perfectibility are explored in depth, as is Spinoza's place within the history of philosophy and his relation to other components of early modern thought. This series is already well respected and eagerly anticipated within the scholarly community.