The present study is an attempt to represent a post-metaphysical thinking that Nietzsche ushered in as a reconstructive ethics. The argument presented here is that the key to such a formulation of ethics resides in Heidegger's 'fundamental ontology' as 'original ethics' ('Letter on Humanism'). Such a formulation that is grounded in an ontology deconstructs that subjectivity and rationality which has been posited by traditional ethics or moral reasoning. The outcome of such a restructuring of reason in Western thinking ushers in an historical essence that problematizes thinking in terms of an issue that Heidegger raised regarding ground in reason and thinking itself. The vantage point of viewing such a development in ethics is that of a tran...