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"It was more than a year since his death, more than a year since the news came; she [the Intended] seemed as though she would remember and mourn forever […]. But while we were still shaking hands, such a look of awful desolation came upon her face that I perceived she was one of those creatures that are not the playthings of Time. For her he had died only yesterday. And, by Jove! the impression was so powerful that for me, too, he seemed to have died only yesterday – nay, this very minute. I saw her and him in the same instant of time – his death and her sorrow – I saw her sorrow in the very moment of his death. Do you understand? I saw them together – I heard them together." (3.53)
Kurtz’s Intended seems as if she is not susceptible to the ravages nor the comforts of passing time. She stretches the time of mourning into eternity.
"I looked around, and I don't know why, but I assure you that never, never before, did this land, this river, this jungle, the very arch of this blazing sky, appear to me so hopeless and so dark, so impenetrable to human thought, so pitiless to human weakness." (3.3)
Nature seems to Marlow completely "hopeless" and "dark," entirely inaccessible to the human mind, incomprehensible and merciless to human weakness. You know, evil.
"Evidently the appetite for more ivory had got the better of the - what shall I say? - less material aspirations. However he had got much worse suddenly. 'I heard he was lying helpless, and so I came up - took my chance,' said the Russian. 'Oh, he's bad, very bad.'" (3.4)
Kurtz is a sick, sick man—in both senses of the word. He's physically sick, but he's mentally sick as well. In fact, it seems like we're supposed to identify physical sickness with mental sickness, as though having a migraine means that you're depraved.