According to the analysis which we have now completed, Being with Others belongs to the Being of Dasein, which is an issue for Dasein in its very Being. Thus as Being-with, Dasein ‘is’ essentially for the sake of Others. This must be understood as an existential statement as to its essence. Even if the particular factical Dasein does not turn to Others, and supposes that it has no need of them or manages to get along without them, it is in the way of Being-with. In Being-with, as the existential “for-the-sake-of” of Others, these have already been disclosed in their Dasein. With their Being-with, their disclosedness has been constituted beforehand; accordingly, this disclosedness also goes to make up significance — that is to say, worldhood. And, significance, as worldhood, is tied up with the existential “for-the-sake-of-which”. Since the worldhood of that world in which every Dasein essentially is already, is thus constituted, it accordingly lets us encounter what is environmentally ready-to-hand as something with which we are circumspectively concerned, and it does so in such a way that together with it we encounter the Dasein-with of Others. The structure of the world’s worldhood is such that Others are not proximally present-at-hand as free-floating subjects along with other Things, but show themselves in the world in their special environmental Being, and do so in terms of what is ready-to-hand in that world.

Being-with is such that the disclosedness of the Dasein-with of Others belongs to it; this means that because Dasein’s Being is Being-with, its understanding of Being already implies the understanding of Others. This understanding, like any understanding, is not an acquaintance derived from knowledge about them, but a primordially existential kind of Being, which, more than anything else, makes such knowledge and acquaintance possible. Knowing oneself (Sichkennen) is grounded in Being-with, which understands primordially. It operates proximally in accordance with the kind of Being which is closest to us — Being-in-the-world as Being-with; and it does so by an acquaintance with that which Dasein, along with the Others, comes across in its environmental circumspection and concerns itself with — an acquaintance in which Dasein understands. Solicitous concern is understood in terms of what we are concerned with, and along with our understanding of it. Thus in concernful solicitude the Other is proximally disclosed. (BTMR:160-161)