Interesting Articles on the Doctrine of Two Kingdoms

In this post I thought I would list some helpful and interesting articles on the Doctrine of Two Kingdoms, or Two Kingdom Theology. This is a doctrine that I believe reflects a proper understanding of Scripture. In various forms it was held by Augustine and then later by Reformers such as Martin Luther and John Calvin, and it is a doctrine that has had a long history among Reformed churches and theologians. It is also a doctrine upon which I and my fellow-blogger Jeff Johnson agree (at least in its Reformed rendering). In fact, our commitment to a form of this doctrine is reflected in some of the articles we have written here (as will be mentioned below).

Here is a helpful introduction by Kim Riddlebarger:

Here are some helpful articles by Michael Horton: