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[Marlow to the Intended]: "'The last word he pronounced was - your name.'" (3.85)
The fact that Marlow says this and the Intended believes him is partially due to the fact that names constitute a very important part of language. They are an indication of identity.
"'To the very end,' I said, shakily. 'I heard his very last words. . . .' I stopped in a fright.
'Repeat them,' she murmured in a heart-broken tone. 'I want–I want–something – something – to – to live with.'
I was on the point of crying at her, 'Don't you hear them?' The dusk was repeating them in a persistent whisper all around us, in a whisper that seemed to swell menacingly like the first whisper of a rising wind. 'The horror! The horror!'" (3.80-82)
That Kurtz’s last words drum repeatedly in Marlow’s mind reinforces the idea that words last forever.
"'No!' she [the Intended] cried. 'It is impossible that all this should be lost – that such a life should be sacrificed to leave nothing - but sorrow. You know what vast plans he had. I knew of them, too – I could not perhaps understand - but others knew of them. Something must remain. His words, at least, have not died.'
'His words will remain,' I said." (3.68-69)
Words, it is suggested, are the only things that remain forever, that can capture memory and not fade away into nothingness.