Heidegger's thought in itself.
In a 1964 letter reflecting on his path of thought hitherto, he confesses:
Apart from the thing lecture, I have never presented my own thinking purely on
its own terms in publications even once hitherto, however far it has come in the
meantime, but rather have presented it always only in such a manner whereby,
as a first attempt, I have sought to make my thinking understandable in terms of
It behooves us then to take up Heidegger’s thinking “on its own terms.”
From Andrew Mitchell's "Heidegger’s Fourfold: On the Relationality of Things", Heidegger Circle 2013 Proceedings, p. 92.
Fifty years on, the Beiträge
, Black Notebooks, present his own thinking, but the canonical understanding doesn't yet include the fourfold.