From his introduction to Witsius’ Economy of the Covenants,

Who is God? God is the triune Creator, who purposes to have a covenant people whom in love he will exalt for his glory. (“Glory” there means both God’s demonstration of his praiseworthiness and the actual praising that results.) Why does God so purpose? –why, that is, does he desire covenantal fellowship with rational beings? The most we can say (for the question is not one to which God has given us a direct answer) is that the nature of such fellowship observably corresponds to the relatonships of mutual honor and love between Father, Son, and Holy Spirit within the unity of the divine being, so that the divine purpose appears to be, so to speak, an enlarging of this circle of eternal love and joy. In highlighting the thought that covenantal communion is the inner life of God, covenant theology makes the truth of the Trinity more meaningful than it can otherwise be.

Reminds me of something I read about Peter Leithart recently. Also…