Trinity and Quadriga

Doug Jones suggests the following, promising Trinitarian account of the quadriga:

Literal – Father (origins)
Allegorical – Son (obvious enough)
Anagogical – Spirit (completion)

That of course leaves the tropological, but this has to do with the formation of the believer. In a Trinitarian perspective, the tropological points to the incorporation of the believer into the Triune life originating from the Father, fulfilled in the Son, brought to completion in the Spirit. Scripture and particular passages of Scripture indicate what the Father has done, how the Son has brought the Father’s promises to fulfillment, and how the Spirit will bring the work to ultimate completion; AND, each passage tells how the believer is to be included in that Triune work.