[O]n this point, Heidegger drew his inspiration from Aristotle (not Husserl) and specifically from Aristotle's Metaphysics, Theta 10 at 1051b, admittedly a difficult text to decipher, where Aristotle states that "being" is spoken of not only in terms of the categories and with respect to the potentiality and actuality of these, but also in the most proper sense (reading kyriotaton) as the "true." Heidegger understands this text to be the culmination of Aristotle's teaching in Theta and as the completion of the discussion of "truth" in Epsilon 4 (1027b). In his view, Aristotelian scholars who have questioned or dismissed the significance of Theta 10 -- Schwegler and Jaeger most notably - are simply displaying the modern philosophical habit of thinking that "truth" has nothing to do with "being" and is to be regarded only as an epistemological or logical phenomenon. Countering this modern bias, Heidegger calls Theta 10 "the keystone of Book Theta, which is itself the center of the entire Metaphysics," and he elaborates how in this chapter Aristotle speaks of the being as true (on hos alethes) as what is most proper (kyriotaton) to the being. That is, for Aristotle, the primary and proper locus of "truth" is the being as manifestive, as showing itself as it is. This is precisely the Aristotelian insight -- and the ancient Greek experience more generally -- that Heidegger thought was "forgotten" thereafter in the metaphysical tradition, including in the Middle Ages.
