“The conception of the church as the restoration of order in the world, means that the church cannot be thought of apart from the world, or as a secure corner of redemption in it. That is so because the order which is being restored in the church is nothing else than the restoration of the image of God in man and the three spheres of order are interrelated. The restoration of man will thus entail the restoration of order in the world. Calvin’s political activism then, may be traced directly to his conception of the church, as that movement which stands at the frontier of history, beckoning the world towards its appointed destiny.”
Benjamin Charles Milner Jr
Calvin’s Doctrine of the Church
Calvin did not restrict the righteousness that God demands to the abstracted atomized individual nor to the church realm. Calvin saw that the church as organism was to be God’s means by which order in the world would be restored. This understanding flies in the face of the Church’s century long hibernation in pietism and in the face of the militant amillennialism we call R2K. For both pietism, and R2K, the church is a monastic retreat center that does not engage with the world so as to re-order it in Christ honoring direction.
This quote also touches on why the modern Reformed world so thoroughly hates theonomy in any expression. Theonomists, agreeing with Calvin (see his series of sermons on Deuteronomy titled “The Covenant Enforced”), understand that the church, as God’s mouthpiece, works to restore the world by proclaiming what God’s righteousness concretely looks like as revealed in God’s moral law and the general equity of His civil law.
There is definitely a flavor of postmillennialism in the quote above. There is the expectation that the realm of “the world” will shrink as it is re-ordered consistent with God’s revelation.