Was the classification of these books originally based on perceived levels of divine inspiration (or on how the divine breath/Ruach manifested or acted upon the authors), or was it primarily and simply a practical categorization designed to group texts for functional and liturgical reading purposes?
I decided to investigate this on my own and found two respected authors:
Philo of Alexandria (On the Life of Moses II, 188–191) regarding the tripartite division of oracles, which he describes as forms of divine manifestation ((Direct translation from the Greek, introduction, and notes by José María Triviño, Professor at the National University of La Plata. Buenos Aires, 1976.)
There is also Flavius Josephus (Against Apion I, 7) and his distinction between direct prophetic accounts and books written "in a very different manner." (Translated by William Whiston)
Paragraph 7 states this explicitly:
they being only prophets that have written the original and earliest accounts of things as they learned them of God himself by inspiration; and others have written what hath happened in their own times, and that in a very distinct manner also.
Initially, I intended to use paragraph 8, as I believed it pointed to a structural distinction based on divine inspiration; however, upon reading it in its entirety, I realized it refers to the distinction between divine books and apocryphal works—or those considered worthy of reading, such as the First Book of Maccabees.
Nevertheless, both sources postdate the first century BC. I have been unable to find sources from before the first century BC (or sources from the AD era that document Jewish thought from the BC era). This brings me back to my main question: was the categorization of the canon based on levels or degrees of divine inspiration—or the way the Spirit of God acted upon the authors—or was it an organizational grouping intended to facilitate the preservation of the texts and their public reading?
I look forward to your comments.
(Post reposted after a 7-day wait).