In this passage, the narrator reflects on his experience as he navigates a fire-ship through darkness. He feels enveloped by shadows, which intensifies his perception of the fiery chaos surrounding him, revealing the madness and horror in others. This heightened awareness comes as he confronts terrifying visions that manifest before him.
As he struggles with overwhelming drowsiness at the helm, the narrator recognizes how these horrific images begin to influence his own state of mind. The connection between his internal struggle and the external madness signifies the impact of the nightmarish environment on his psyche. His vulnerability during this dark voyage serves as a metaphor for the broader journey of madness and confrontation with one's fears.