Here is catechesis at its best, instructing the student of theology, providing pastors with a sermon-enriching manual, and giving growing Christians a resource book that will both inform and nourish them, as well as provide endless theological enjoyment!" —Sinclair B. Ferguson, Chancellor's Professor of Systematic Theology, Reformed Theological Seminary; Teaching Fellow, Ligonier Ministries The aim of systematic theology is to engage not only the head but also the heart and hands. Only recently has the church compartmentalized these aspects of life—separating the academic discipline of theology from the spiritual disciplines of faith and obedience. This multivolume work brings together rigorous historical and theological scholarship with spiritual disciplines and practical insights—characterized by a simple, accessible, comprehensive, Reformed, and experiential approach. In this volume, Joel R. Beeke and Paul M. Smalley unpack the work and role of the Holy Spirit (Pneumatology) and sal