'This is the most comprehensive and philosophically incisive study to date of Kant's engagement with the ancient Stoic tradition. It shifts attention from the familiar focus on Kant's pure moral theory to his later works, where questions of moral development, human psychology, and collective progress take center stage. The result is an interpretive breakthrough that will command the attention not only Kant specialists and scholars of ancient philosophy, but also moral philosophers and historians of ideas.' Michael Vazquez, University of North Carolina, Chapel Hill