John Owen (1616–1683), sometime chaplain to Oliver Cromwell and vice-chancellor of Oxford University, was by common consent the greatest of the Puritan theologians. He was a prolific and masterful writer, as his treatises on trinitarian faith and life, the person and work of Christ and of the Holy Spirit, justification by faith, the Christian’s communion with God, the eternal security of the saints, and the nature, life, and order of the church abundantly show. Built on mainstream Reformed