Full Idea
Immortality without memory would be useless.
Gist of Idea
Immortality without memory is useless
Source
Gottfried Leibniz (Letters to Antoine Arnauld [1686], 1686.07.4/14 X)
Book Reference
Leibniz,Gottfried: 'The Leibniz-Arnauld Correspondence', ed/tr. Mason,HT/Parkinson,GHR [Manchester UP 1967], p.64
A Reaction
I would say that having a mind of any sort needs memory. The question for immortality is whether it extends back to human life. See 'Wuthering Heights' (c. p90) for someone who remembers Earth as so superior to paradise that they long to return there.