Angst is being towards its potentiality-for-being
Angst makes manifest in Dasein its Being towards its ownmost potentiality-for-being – that is. its Being-free for the freedom of choosing itself and taking hold of itself. Angst brings Dasein face to face with its Being free for (propensio in… ) the authenticity of its Being, and for this authen ticity as a possibility which it always is.
Martin Heidegger in Being in Time