On the one hand, if modern linguistics remains completely enclosed within a classical conceptuality, if especially it naively uses the word being and all that it presupposes, that which, within this linguistics, deconstructs the unity of the word in general can no longer, according to the model of the Heideggerian question, as it functions powerfully from the very opening of Being and Time, be circumscribed as ontic science or regional ontology. In as much as the question of being unites indissolubly with the precomprehension of the word being, without being reduced to it, the linguistics that works for the deconstruction of the constituted unity of that word has only, in fact or in principle, to have the question of being posed in order to define its field and the order of its dependence.
Not only is its field no longer simply ontic, but the limits of ontology that correspond to it no longer have anything regional about them. And can what I say here of linguistics, or at least of a certain work that may be undertaken within it and thanks to it, not be said of all research in as much as and to the strict extent that it would finally deconstitute the founding concept- words of ontology, of being in its privilege? Outside of linguistics, it is in psychoanalytic research that this breakthrough seems at present to have the greatest likelihood of being expanded.
Within the strictly limited space of this breakthrough, these “sciences” are no longer dominated by the questions of a transcendental phenomenology or a fundamental ontology. One may perhaps say, following the order of questions inaugurated by Being and Time and radicalizing the questions of Husserlian phenomenology, that this breakthrough does not belong to science itself, that what thus seems to be produced within an ontic field or within a regional ontology, does not belong to them by rights and leads back to the question of being itself.
Because it is indeed the question of being that Heidegger asks metaphysics. And with it the question of truth, of sense, of the logos. The incessant meditation upon that question does not restore confidence. On the contrary, it dislodges the confidence at its own depth, which, being a matter of the meaning of being, is more difficult than is often believed. In examining the state just before all determinations of being, destroying the securities of onto-theology, such a
meditation contributes, quite as much as the most contemporary linguistics, to the dislocation of the unity of the sense of being, that is, in the last instance, the unity of the word.
(Derrida, Of Grammatology, 21-22)