In "Heart of Darkness," the narrator reflects on two significant figures who embody the themes of life and death. One figure represents the unknown, continuously leading others into darkness, while the other observes those entering with a detached demeanor, seemingly indifferent to their fate. This duality highlights the inevitability of mortality and the mystery that encompasses human existence.

The phrase "Morituri te salutant," meaning "Those who are about to die salute you," underscores the gravity of their roles. The knitter of black wool symbolizes the ever-present shadow of death, while the chance of survival for those she observes is minimal. Conrad uses this imagery to evoke a sense of foreboding and reflect on the uncertain nature of life.