The “destructive” appropriation of the Aristotelian concepts of δύναµις and ἐνέργεια played a central role in Martin Heidegger’s own reflection on the meaning of being. While this has been generally known for some time, it is only now that we can understand the full scope, complexity and evolving character of this appropriation. One reason is the fairly recent publication of notes and protocols for seminars Heidegger led on Aristotle as late as the 1940s and 1950s. Another is the existence of (...) student transcripts in the Special Collections Department of Stanford University for a number of unpublished seminars on Aristotle that Heidegger led during the 1920s. Considering all of this material enables us to see both the significance of Heidegger’s interpretation of the δύναµις/ἐνέργιεα pair as well as how this interpretation evolved along with his own “Kehre”: from a “pandynamic” conception of being to being as “Ereignis.”. (shrink)