The Shema has many interpretations, philosophical, eschatological, national, etc. A historical-critical way to understand the Shema is to read it (and Deuteronomy more broadly) against the backdrop of Assyrian domination, when Assyria touted their god Ashur as the supreme master of the world.
Daniel M. Zucker
The division of the Torah into five books is not mentioned anywhere in the Bible, yet this division may be ancient and inherent. Already in Second Temple times, Philo speaks of it, and by the early first millenium C.E., the Torah became known by the Greek name, Pentateuch, literally, “five scrolls.” Is this division due to practical, thematic, or symbolic considerations?