This book presents an invaluable selection of sermons and theological treatises of the twelfth century author, Isaac of Stella. The English born abbot of the French Cistercian monastery of Stella on the Isle of Re is one of the most inspiring, yet equally elusive, representatives of the great twelfth-century Cistercian Renaissance more widely associated with the person of Bernard of Clairvaux. The astonishing spiritual and intellectual depth of Isaac's surviving writings makes him a valuable read for anyone aiming to receive a complete picture of the intellectual heritage of the Middle Ages. Of the twenty-five sermons by Isaac presented in this volume, ten are made available here in an English translation for the first time. These are accompanied with two new studies examining Isaac of Stella's work from an historical, literary as well as theological perspective.