Heidegger said "Sein zum Tode", or one's awareness of & readiness for this event, is the key to authentic being
Becoming free for one's own death in anticipation frees one from one's 
lostness ... rather, is a person's being-toward-death (Sein zum Tode): not the 
event of... [DOC] [TLE] Inauthenticity and Self-Deception in Heidegger's Being and Time in ... [PAR] being in a situation (Situation), being-towards-death (Sein zum Tode), the ...... 
Temporality is thus a key concept if we are to understand Being.