This volume provides a new contribution to the understanding of twelfth-century monasticism and medieval intellectual culture by exploring the relationship between water and the composition of thought. It provides a fresh insight into twelfth-century monastic philosophies by studying the use of water as an abstract entity in medieval thought to frame and discuss topics such as spirituality, the natural order, knowledge visualization, and metaphysics in various high medieval texts, including Godfrey of Saint-Victor’s Fons Philosophiae, Peter of Celle’s letter corpus, and the Description of Clairvaux. Through case studies of water in poetry, landscape narrative, and epistolary communication, this work traces the role of water as a uniquely medieval instrument of thought. Theoretical chapters of this book use water to explore the shaping of the medieval metaphor. Further case studies examine the differing and complex uses of water as a metaphor in various monastic texts. Focusing on the changeable power and material properties of water, this volume assesses the significance and deployment of environmental imagery in the composition, narration, and recollection of organized thought within the twelfth-century monastic community.