Genealogy and Groundwork

The Genealogy of Morals can be interpreted as a Naturalistic critique of the Groundwork of the Metaphysics of Morals, with each of its three chapters a counterpart to each of those of the latter, respectively.  In his first chapter, Kant abstracts a principle from conventional Morality.  In the second, he derives that principle from the Reason within the individual.  In the third, he grounds that principle in the thesis that the individual inhabits two worlds.  In contrast, Nietzsche first exposes Kant's example of conventional Morality as contingent.  Second, he demonstrates how the 'Reason' of the individual consists in an internalization of conventional Morality.  Finally, he explains how the 'second world' is no more than a product of the imagination of members of the first, and only, world.  Aside from the parallel structures of the titles of the two works, the best textual evidence that such a contrast is at least part of Nietzsche's ambition is his highlighting, at the outset of his second part, of Promising, a seemingly trivial practice, except that it plays a pivotal role in Kant's second chapter.