[Death] is a safety-device because, once Man has fallen, natural immortality would be the one utterly hopeless destiny for him.
We declare that only man exists. This is not to say that material, inorganic nature and nonhuman beings--animals and plants--are in any sense unreal, insubstantial, or illusory beccause they do not so exist. We merely state that the reality of these nonhuman realms differs from that of human existence, whose primary characteristic is Dasein (literally being-the-there)...Man as man is present...in a manner wholly different from...inanimate things.
You know how when you were a little kid and you believed in fairy tales, that fantasy of what your life would be, white dress, prince charming who would carry you away to a castle on a hill. You would lie in bed at night and close your eyes and you had complete and utter faith. Santa Claus, the Tooth Fairy, Prince Charming, they were so close you could taste them, but eventually you grow up, one day you open your eyes and the fairy tale disappears. Most people turn to the things and people they can trust. But the thing is its hard to let go of that fairy tale entirely cause almost everyone has that smallest bit of hope, of faith, that one day they will open their eyes and it will come true.