This book argues for the separation of the church and the state. Additionally, Estelle claims that the historically reformed position is that Christ is ruler of all; however, he manifests his rule in different ways. These basic categories, i.e., that God rules the church as a redeemer (a spiritual kingdom) and rules the state and all other social institutions (the civil kingdom) as creator and sustainer, has been widely held by Reformed thinkers for centuries until the modern period. Estelle claims that without this bedrock truth, any attempt to describe the primary mission of the church will collapse.