Rosanne E. Elder, PhD, introduced William of Saint-Thierry with his profound theology and spirituality to the English-speaking world in a groundbreaking manner. This festschrift bears witness to her past and ongoing dedication to this twelfth-century monastic theologian. The essays in this volume present William, author of the Vita Prima, as an intimate friend of Bernard of Clairvaux. Along with Bernard, William's writings challenge us, today, to engage theology not only academically, but also as a personal spiritual pursuit of deification into the mystery of God through Unity of Spirit. The contributors to this festschrift reveal various dimensions, `treasures,' of William's teaching and inaugurate a vision for further scholarly research and spiritual growth.Abbot Thomas X. Davis, OCSO