In Proposition 79, George Peters states:
“The Kingdom of God, promised by covenant and prophets, is to be distinguished from the general and universal Sovereignty of God.”
God is Sovereign and His Kingdom is eternal. These are basic theological facts that cannot be ignored or denied. God as sovereign Lord needs to be differentiated from the Kingdom of God promised in Scripture, namely the covenant made with David upon whose throne the Messiah will be seated. God is and always will be sovereign Lord over all. The Davidic Kingdom and throne; however, has not been perpetual.
The most notable observation Peters presents in Proposition 79 is the following:
“It is noticeable that in works of Systematic Divinity this Sovereignty is placed under the part pertaining to God and His general government, and is separated from the promised Kingdom of Christ by treating of the latter under the Part relating to Christ and His work. A distinction is observed, made, and taught in a specific form, but practically it is ignored, and in definitions it is made to disappear, forgetting that thus a radical defect is introduced, and a palpable contradiction is involved. For, uniting the two and making them one (even for a moment), intermitted, the subjected of recorded promises as something to come, to be inherited, etc.”
I will have to check the various systematic theology texts I have in my library to see in what section the doctrine of the Kingdom is discussed. I can see the plausibility of discussing the Kingdom of God within a section on the attributes of God (i.e. His sovereignty) provided of course the important distinction being made in this proposition and observation are correctly noted. The differences are important and care must be taken to ensure they are not lumped into a single conversation so as to ensure the specific unique elements are properly represented and understood.