Michael Horton reminds us that the Trinity is important even in our formulation of the doctrine of inspiration:
If our doctrine of inspiration is concerned exclusively with the authoritative source (the Father’s speaking), it will gravitate toward a mechanical view. We cannot develop an adequate doctrine of inspiration from an abstract concept of its supernatural origin independent of its content. Yet if it is focused exclusively on the saving content (Jesus Christ), it is likely to yield a canon-within-a-canon approach, limiting inspiration to that which exclusively preaches Christ (leaving such determination to exegetes). At the same time, focusing one-sidely on the Spirit in our doctrine of inspiration typically generates various forms of mysticism and enthusiasm that separate the Spirit from the Word.
Horton, A Christian Faith, 157