Immortality (n.) expresses, negatively, the dead one's refusal to fall into the time of the other.
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Immortality (n.) in a person is a contradiction in terms: Dasein is only possible as mortal.
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Immortality (n.) is a horror: 'tomorrow, alas, one will still have to live' — a tomorrow contained in the infinity of today.
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Immortality (n.) sought by the isolated soul in continuous time is a trap: identity affirmed obsessively, and tedium taking on its proportions.
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Immortality (n.) would make war impossible: as causa sui, free beings could not grapple with one another in dumb and absurd hatred; were they only mortal, they would already be dead.