vol. 30 núm. 101 (2009)

In order to understand “Sein und Zeit” we have to ask from begining to end how Heidegger articulates the two dimensions of the existence that he calls “Eigentlichkeit” and “Unei-gentlichkeit”. Against the usual interpretation, in this article we defend that the speech of Heidegger rests in a well controlled ambiguity, behind which a strong thesis hides: that the “Uneigentlichkeit” is the only possible way of existence. The “Entschlossenheit” does not constitute an alternative existence to the “Uneigentlichkeit”. On the contrary, it is the recognition that the only possible existence is the “Uneigentlichkeit” (this is to appropriate properly the “Uneigentlichkeit”). That is why the “Sorge”, that is, the “uneigentlich” existence, is the only definition of the Dasein that Heidegger proposes. In fact, the colossal attempt of Sein und Zeit is to show that nihilism or skepticism (that is, the equivalence between the truth and the not-truth) is the only acceptable option of thought.Key words: Being, existence, Eigentlichkeit, Uneigentlichkeit, nihilism