The quote reflects a deep emotional state, with the "mournful and restless sound" symbolizing inner turmoil and contemplation. It suggests that the environment itself resonates with the character's feelings, enhancing the intensity of their thoughts and reflections.
In "Lord Jim," Joseph Conrad effectively uses this auditory imagery to evoke a sense of melancholy. The sound serves as a backdrop for the protagonist's existential musings, illustrating the connection between external elements and internal struggles, which is a central theme in the novel.