"...each individual person is unique and inexplicable in terms of any scientific or philosophical system. The individual has freedom of choice, which makes his or her future unpredictable and a source of anxiety. A central theme... is the inevitability of death. This fact found the most articulate expression in Martin Heidegger's _Sein_unt_Zeit_ (1927). According to his description, human beings are cast into an unfreindly world, desperately trying to achieve goals the relevance of which will be mercilessly annihilated by death. They might try to avoid the thought of this final destiny by living in a superficial and conventional way; however, this gives life an inauthentic quality. The only way to be true to oneself is to be constantly aware of one's eventual death."