Quote 4
"She [the Intended] said suddenly very low, 'He died as he lived.'
'His end,' said I, with dull anger stirring in me, 'was in every way worthy of his life.'" (3.73-74)
Well, this is a skillfully ambiguous statement. Marlow manages to condemn Kurtz (since his life wasn't so great) while still letting the Intended think that he was a great guy. Nicely done.
Quote 5
"'No!' she [the Intended] cried. 'It's 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.'" (3.68)
The Intended can't deal with Kurtz being totally gone from the world. Luckily, Conrad wrote this book to keep his memory alive.