This volume in Weidner's unfinished Christian Dogmatics series expounds upon the doctrine of the Holy Spirit. This book is not, however, a Pneumatology in the traditional sense; rather than simply explaining the person of the Holy Spirit, Weidner emphasizes His work in the individual believer. This book is essentially a treatment of the traditional Lutheran ordo salutis. Weidner discusses important topics such as: the call, justification, sanctification, and the mystical union. Throughout the text he utilizes classic Lutheran writers, along with nineteenth century European theologians. He contrasts the Lutheran ordo salutis with that of the Reformed church.