I have long been aware that on the question of sola scriptura, "sufficiency" is read with a sense of only or exclusively e.g. 2 Tm 3:16-17. In another thread (saints praying for us) a similar argument was made with regards to intercession - one sufficient intercessor eliminates possibility of other intercessors. I would paraphrase this as a frugal God to use non-theological language. What theological or biblical interpretation resources directly address this sufficient=only line of interpretation. I've not been able to find a starting point of a thread to research, perhaps because I have no clue as to the appropriate language used by these traditions.