God: "Both One and Complex"

“In God’s nature, He is, ‘both one and complex.’ God is one—one substance, one essence, one being. And yet God is also three hypostases; three divine hypostases (Persons) make up the Godhead. Frame is careful to note that, while the Father, Son and Holy Spirit are related to one another in something like a triperspectival way, they are not merely perspectives on one another, which would be Sabellianism. We know this from Scripture; there are transactions between the three Persons.”
—The Doctrine Shapes the Defense, p. 3