Memory (n.) of a lost friend is roused, not resurrected, by old haunts — as a dead friend's slave, cloak or house renews grief already softened by time.
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Memory (n.) is like bitter fruit or the sharpness of a very old wine: when it turns to departed friends, the sourness itself stimulates the palate.
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Memory (n.) may be more reliable when it has no external aids to lean on.
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Memory (n.) is our resource against loss: to have may be taken from us, to have had, never.
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Memory (n.) left unused is a book whose rolls have stuck together: the mind needs unrolling from time to time.