The quote "It echoed loudly within him because he was hollow at the core" from Joseph Conrad's "Heart of Darkness" captures a profound sense of emptiness and internal conflict within the character. The imagery of echoing suggests that the character is deeply affected by his surroundings and experiences, yet his lack of substance contributes to a feeling of hollowness. This emptiness signifies a struggle with identity and meaning in a chaotic world.

In "Heart of Darkness," this hollowness reflects the broader themes of colonialism and moral ambiguity. The character's emotional void highlights the impact of external influences on one's psyche and reveals the existential struggles individuals face when confronted with the darkness of human nature. Conrad uses this metaphor of hollowness to explore the depths of human despair and the search for purpose amidst the horrors of life.