Ames, in his Marrow of Theology, describes two distinct Kingdoms: the Kingdom of God’s grace (the Church) and the kingdom of God’s power (the whole universe.) Both are under His law, without any distinction made between general and special revelation. Modern “R2K” teaching strangely makes a complete separation between God’s law in general and special revelation, says only the former applies outside the church, and often seems to imply that it in fact says something different from what the law in special revelation says. But classical reformed theology said that in order to be correct, because of sin, our understanding of general revelation must be corrected by the Scriptures, to make it accurate. (Dogmatics, Mueller.) This has ramifications for the “secular” kingdom.
The Historic Reformed 2 Kingdoms doctrine vs. modern “R2K”