Heidegger said you can't truly live until you face your own death

Heidegger argued that most people flee from thinking about their own death, losing themselves in everyday routines and other people's expectations. Genuine, authentic existence begins only when you confront death as your ownmost possibility, the one thing no one else can do for you. This confrontation, 'being-toward-death,' snaps you out of autopilot and into owning your finite life.

— Martin Heidegger, Being and Time — Sein und Zeit, 1927, Division II
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