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"She struck me as beautiful—I mean she had a beautiful expression. I know that the sunlight can be made to lie, too, yet one felt that no manipulation of light and pose could have conveyed the delicate shade of truthfulness upon those features. She seemed ready to listen without mental reservation, without suspicion, without a thought for herself." (3.50)
Marlow is attracted to Kurtz's Intended not only because of her feminine beauty, but for her seemingly open expression and innocence.
"Their [the Intended's eyes'] glance was guileless, profound, confident, and trustful. She carried her sorrowful head as though she were proud of that sorrow, as though she would say, 'I - I alone know how to mourn for him as he deserves.'" (3.53)
Marlow sees the Intended as pure and "guileless," especially noting the honest expression of pain in her eyes. But is she really, or is this just, like, his opinion, man?
[Marlow]: "'It was impossible not to—'
'Love him,' she [the Intended] finished eagerly, silencing me into an appalled dumbness. 'How true! how true! But when you think that no one knew him so well as I! I had all his noble confidence. I knew him best.'" (3.56-57)
Oh girl, you don't know him at all.