 Since humans’ emergence from the pre-cultural and pre-civil states of nature is neither strictly concomitant or parallel, nor sequential, the development of DJN after Book III cannot be strictly continuous in either a topical or historical sense. Rather, it falls into two partially overlapping sectors. Books IV–V deal with human efforts to leave the natural state of need (indigentia), while Books VI–VIII address the problem of security created by weakness (imbecillitas). Both require the creation of new, complex, and formally organized kinds of human cooperation that address both the growing diversity and inconsistency of human desires, and the increase in human numbers.