James B. Walker wrote The Doctrine of the Holy Spirit to glorify the true God, manifested in Christ, and revealed through Christ by the Holy Spirit. He examines the Holy Spirit in the Old Testament, the relative place of the Spirit and the Word in the economy of the divine mind, and the Holy Spirit in the personality of Christ. Walker then discusses the endowment and supervision of the Apostles by the Holy Spirit, the union of the Word and Spirit in the process of sanctification, the work of Christ by the divine Spirit in the minds of believers, and the work of the Holy Spirit with the impenitent.