The three “existentialia” that structure Dasein’s Being-in-the-world make up the “formal existential totality of Dasein’s structural whole”, what Heidegger calls care. To be Dasein, an entity must have some sense of what it is “coming toward” (Zu-kunft, the German for “future”), what has “come before” (what is “passed”, Vorbei), and what one is dealing with in one’s current situation (“making present”). The defining characteristics of Dasein’s potentiality-for-Being are displayed in the transformative events that lead to the possibility of being authentic (eigentlich, as we saw, from the stem meaning “proper” or “own”). When Dasein confronts and grasps its authentic possibility of being, it becomes possible to see the whole of Dasein, including both its being as a They-self and as authentic being-one’s-self.  “Dasein is authentically itself in [its] primordial individualization”, where the “constancy [Ständigkeit] of the Self … gets clarified” (1962 [1927]: 322).  What defines the wholeness and unity of Dasein is determined not by an underlying substance (e.g., the sub-ject, that which underlies), but by the “steadiness and steadfastness” (beständigen Standfestigkeit, ibid) of authenticity.