Hegel presents two very different accounts of the initial categorization of essence in his Science of Logic and his later Encyclopedia Logic, thereby raising the question of whether this discrepancy undermines the univocal necessity of systematic logic. A close examination of these arguments reveals that the Science of Logic account captures a necessary ordering that is incompletely presented in the Encyclopedia. The details are provided for comprehending why the logic of essence must begin with a contrast of the essential and (...) the unessential, how this reverts to illusory being, and why identity depends upon the transformation of refl ection from being positing to being external to being determining in character. Significantly, the self-developing nature of these logical developments calls into question the foundationalism entailed by any privileging of the categories of essence. (shrink)