Our lives are ephemeral. We will die. At best we can live to be around 120 years old. At worst, we might die today.
Nihilism: the philosophy that “what’s the point of doing anything or living or striving for anything if we’re gonna die anyways?”
My thought: the fact that everything is ephemeral is what makes life so beautiful, worthwhile, and great. Death and impermenance is the best accompaniment to life, and the best invention! A life of immortality is a boring one, and even the gods strain (vainly) against boredom.