Ontically, of course, Dasein is not only close to us―even that which is closest: we *are* it, each of us, we ourselves. In spite of this, or rather for just this reason, it is ontologically that which is farthest. To be sure, its ownmost Being is such that it has an understanding of that Being, and already maintains itself in each case as if its Being has been interpreted in some manner. But we are certainly not saying that when Dasein's own Being is thus interpreted pre-ontologically in the way which lies closest, this interpretation can be taken over as an appropriate clue, as if this way of understanding Being is what must emerge when one's ownmost state of Being is considered as an ontological theme. The kind of Being which belongs to Dasein is rather such that, in understanding its own Being, it has a tendency to do so in terms of that entity towards which it comports itself proximally and in a way which is essentially constant―in terms of the 'world'. In Dasein itself, and therefore in its own understanding of Being, the way the world is understood is, as we shall show, reflected back ontologically upon the way in which Dasein itself gets interpreted.Thus because Dasein is ontico-ontologically prior, its own specific state of Being (if we understand this in the sense of Dasein's 'categorial structure') remains concealed from it. Dasein is ontically 'closest' to itself and ontologically farthest; but pre-ontologically it is surely not a stranger."―from_Being and Time_. Translated by John Macquarrie & Edward Robinson, pp. 36-37
Martin Heidegger
existential-thought, metaphysics, ontology, phenomenology