We think about the Bible best not in abstraction but by looking at particular texts. In Romans 15, Paul, too, looks at a text (Psalm 69) to think about the nature and authority of Scripture.
Word & World
Fredrickson, David E. “A Piece of Scripture on Part of the Bible: Listening to Romans 15:1-6.” Word & World 26, no. 4 (2006): 412–18. https://luthersem.idm.oclc.org/login?url=http://search.ebscohost.com/login.aspx?direct=true&db=rfh&AN=ATLA0001537039&site=ehost-live&scope=site.
Fredrickson, David E., "A Piece of Scripture on Part of the Bible: Listening to Romans 15:1-6" (2006). Faculty Publications. 88.