Anyhow, Chester, according to your citation by Augustine and your own assertions, we know that since he based what he believed and taught about Scripture on what the "authority" of the Church of his time taught, we know that the church taught this:
"In order to leave room for such profitable discussions of difficult questions, there is a distinct boundary line separating all productions subsequent to apostolic times from the authoritative canonical books of the Old and New Testaments. The authority of these books has come down to us from the apostles through the successions of bishops and the extension of the Church, and, from a position of lofty supremacy, claims the submission of every faithful and pious mind....In the innumerable books that have been written latterly we may sometimes find the same truth as in Scripture, but there is not the same authority. Scripture has a sacredness peculiar to itself." - Augustine (Reply to Faustus the Manichaean, 11:5)
"For among the things that are plainly laid down in Scripture are to be found all matters that concern faith and the manner of life,--to wit, hope and love, of which I have spoken in the previous book. After this, when we have made ourselves to a certain extent familiar with the language of Scripture, we may proceed to open up and investigate the obscure passages, and in doing so draw examples from the plainer expressions to throw light upon the more obscure, and use the evidence of passages about which there is no doubt to remove all hesitation in regard to the doubtful passages." - Augustine (On Christian Doctrine, 2:9)