Throughout the novel, it was easy to catch onto motifs that symbolized darkness, but harder to pick out the light ones. In Heart of Darkness, darkness was the main motif, showing how gloomy and eery the novel was. Marlow explained the trip down the river as a more horrifying and scary trip than one that was filled with fun adventures and joy. Towards the end of the novel, Conrad brings out specific examples of darkness in scenes like Marlow's visit to the Intended's house and snipits from the Inner Station. When Kurtz was brought onto the boat after caught crawling through the grass, we hear Marlow narrate, "It survived his strength to hide in the magnificent folds of the eloquence the barren of his heart." I interpretted this as Kurtz suddenly realizing some of the bad things that he's done to make the director look down on him- putting them in a dangerous situation with the natives.
As soon as Marlow entered the Intended's house, he felt darker. She was wearing all black, and looked as Kurtz's death was just yesterday- she had never stopped mourning. Not long after he had been there, she started weeping and venting. He says, "I listened. The darkness deepened." Above many people, Marlow realizes the saddness of Kurtz's death, and had no escape from the dark talk he was forced into. He continues to explain the feelings he gained from her venting, "But with every word spoken the room was growing darker, and only her forehad, smooth and white, remained illuminated by the unextinguishable light of belief and love." As the mood grew darker, the more Marlow wanted out.