Part One is just what it says: Inception. Everything begins here; the premises are set up, the motivations delineated (or intimated), the characters introduced. Therefore, the epigraphs aren't quite as complexly symbolic as in later sections.
I'll suspend this discussion at this point and continue with another post on this topic over the next couple of days.
Added later: If you enjoy this post, see Poetry and Epigraphs, Part 2.