最後，一 Dasein 嘅「真實性」(authenticity)問題離唔開Dasein嘅「歷史性」(historicallity)。 一方面，Dasein係會死嘅(mortal)，由生「拉」""stretched along""到死，被氹落呢個世界，即係話，氹入佢嘅咁多「可能性」(possibilities), 呢啲可能性 Dasein 要負責做(?assuming)。 另一方面， Dasein's access to this world and these possibilities is always via a history and a tradition—this is the question of ""world historicality,"" and among its consequences is Heidegger's argument that Dasein's potential for authenticity lies in the possibility of choosing a ""hero.