Mission impossible? Thinking what must be thought in Heidegger and Deleuze

In this paper, I discuss and compare the (im)possibility of thinking that which
is most worth our thought in Deleuze’s What Is Philosophy? (1994) and
Heidegger’s course lectures in What Is Called Thinking? (2004). Both authors
criticize the history of philosophy in similar ways in order to reconsider what
should be taken as the nature and task of philosophical thinking. For
Deleuze, true thinking is the creation of concepts, but what is most worth our
thought in fact cannot be thought. For Heidegger, Being calls on us think,
and to think rightly is to be underway toward thinking itself, a grateful
heeding of Being. In this paper I explore the very possibility to think that
which is most worth our thought. I will argue that although for both authors
proper thinking as such is possible, thinking what is most worth our thought
seems remarkably both possible as impossible.