Phronesis and Energeia : a reading of Heidegger's early appropriation of Aristotelian Phronesis (1922-24) in the light of Energeia

The purpose of this thesis is to sort out the intent, the philosophical relevance and the consistency of Heidegger’s appropriation of the basic tenets of Aristotle’s practical philosophy in his early lecture courses. Our analysis will focus mainly on the key notions of energeia and phronēsis. The first preparatory section of the thesis is devoted to a close analysis of Aristotle’s relevant texts of the Nicomachean Ethics, but also of the Metaphysics, in discussion with other modern commentators. This lays the philological groundwork which will enable us to engage Heidegger’s challenging interpretations on a more secure footing. The second and main section discusses Heidegger’s ontological appropriation of Aristotle’s Nicomachean Ethics from 1922 to 1924 on the basis of the texts so far published, and with a special attention to Metaphysics IX. The main result of section I is an insight into the central character of energeia for Aristotle’s project in the Nicomachean Ethics and, more specifically, for his understanding of praxis, which in its genuinely original sense turns out to be a way of being of human beings. Our analysis recognizes three essential traits to energeia and praxis, two of which stemming from the analysis of Aristotle’s own elucidation of energeia in Metaphysics IX 6, namely immediacy and continuity: energeia expresses being as an ‘immediate unfinished fulfillment’. Irreducibility, the third trait of energeia and praxis, results from applying the structure of energeia to the characterization of praxis in the Nicomachean Ethics, and from contrasting it with poiēsis and theōria. These three features entail that practical truth―the truth of praxis, the ‘object’ of phronēsis―cannot be properly possessed and thus transferred: more than something we know, it is something we are. It is this special character of practical truth that primarily attracted Heidegger to Aristotle in the early 1920s. Section II, devoted to Heidegger’s texts, starts by reconstructing some of the intellectual steps that led him to resort to Aristotle for the development of his own philosophical project, characterized by a profound, yet intriguing intermingling of ontology and phenomenology. The legitimacy and feasibility of Heidegger’s pointedly ontological appropriation of the Nicomachean Ethics is also discussed, on the basis of the results of section I.  The analysis of these texts is characterized by the sharp opposition set by Heidegger between phronēsis and energeia in his 1922 programmatic Natorp Bericht, a perspective that strongly diverges from the results of our philological reading of Aristotle in section I. The assessment of this opposition is maintained throughout the discussion of the two main sources―the 1924-25 winter course Platon: Sophistes, and the 1924 summer course Grundbegriffe der aristotelischen Philosophie. Heidegger’s direct commentary of Aristotle’s text is followed closely in this section: concepts such as energeia, entelecheia, telos, physis and hexis―which find their ontological characterization in the Metaphysics or Physics―need to be scrutinized in order to follow Heidegger’s argument and to assess its soundness. Heidegger’s hypothesis from 1922―namely, that Aristotle’s ontology does not fit the insights of his more penetrating phenomenological descriptions―eventually culminates in a clash between phronēsis and sophia which divides being into two irreconcilable spheres and brings Aristotle’s ontological efforts to a dead end. Yet, this conclusion of Heidegger is built upon a specific interpretation of energeia that critically leaves in the shade its performative side, one of its essential traits as Aristotle conceived it. The fact that in the 30s Heidegger himself comes to see this side of energeia provides us with stronger grounds to question the supposed conflict between ontology and phenomenology in Aristotle, which can result in a new formulation of the Heideggerian project.

Keyphrases: Heidegger, Aristotle, Aristote, Nicomachean Ethics, Praxis, Energeia, Entelecheia, Kinesis, Physis, Metaphysics of presence