Insofar as truth is understood in the traditional "natural" sense as the correspondence of knowledge with beings demonstrated in beings, but also insofar as truth is interpreted as the certainty of the knowledge of Being, aletheia, unconcealment in the sense of the opening may not be equated with truth. Rather, aletheia, unconcealment thought as opening, first grants the possibility of truth. For truth itself, just as Being and thinking, can only be what it is in the element of the opening. Evidence, certainty in every degree, every kind of verification of veritas already move with that veritas in the realm of the prevalent opening.
Aletheia, unconcealment thought as the opening of presence, is not yet truth. Is aletheia then less than truth? Or is it more because it first grants truth as adequatio and certitudo, because there can be no presence and presenting outside of the realm of the opening?
This question we leave to thinking as a task. Thinking must consider whether it can even raise this question at all as long as it thinks philosophically, that is, in the strict sense of metaphysics which questions what is present only with regard to its presence.
In any case, one thing becomes clear: To raise the question of aletheia, of unconcealment as such, is not the same as raising the question of truth. For this reason, it was inadequate and misleading to call aletheia in the sense of opening, truth.
Pp. 69-70