We’re talking about God as He is in Himself (that’s the ontological or immanent Trinity) and God as He reveals Himself (that’s the economic Trinity). The ontological or immanent Trinity describes the Trinity as He is and as He would be, whether or not He had ever created the world—God as He always has been. We can probably make this simplest by talking about different statements that we make about the triune God, and try to classify them as ontological statements or economic statements.