"Considering the disparate nature of the sources, Silvers does an excellent job situating Wāsiṭī within the larger eastward movement of Baghdadi Sufism … Silvers is able to breathe life into Wāsiṭī's thought." — Review of Middle East Studies"Silvers' approach is refreshing and useful as she details the historical context as well as the intellectual history of early mystics … Silvers offers us a comprehensive and comprehensible presentation of the intellectual development of Islamic mysticism and metaphysics within the context of the historical development and spread of Sufism." — NewBooksinIslamicStudies.com