After a century of study and debate, the doctrine of sanctification, formulated by John Wesley in the 18th century, has resulted in two contemporaneous and competing definitions of entire sanctification in the Nazarene denomination. Mark Quanstom examines the gradual change in understanding this doctrine by focusing on its history and development in a balanced and well-researched perspective.'Quanstrom effectively follows the various understandings of holiness that have shaped and been shaped by the Church of the Nazarene. His engaging style and clear writing makes this work valuable to laymen, ministers, students, and scholars.'-Dr. John C. BowlingPresident, Olivet Nazarene University 'This work is a welcome contribution to the contemporary conversation about Holiness theology. Quanstrom's thoughtful and careful scholarship produces a balanced study of the historical development of the understanding of holiness. . . It calls us to an awareness of the dynamic character of this tradition and to an active engagement with the doctrine of Christian perfection that remains at the heart of who we are.'-Dr. Carl M. LethChairman Division of Religion and Philosophy, Olivet Nazarene University