Final answer:
The lines from the story emphasize the theme that the human affinity for art, such as music, can provide spiritual nourishment and elevate one's experience beyond mere survival, contributing to the story's deeper message about the human condition.
Step-by-step explanation:
The lines, highlight the transformative power of art, in this case, music, to so deeply influence someone that it becomes a source of spiritual or emotional sustenance. This reflection demonstrates a moment of enlightenment for the character, proposing that his appreciation for music elevates him beyond his beast-like state. Such a metamorphosis is indicative of a theme that explores the concept of the human condition and what truly separates mankind from animals. The character's yearning for music as 'unknown nourishment' illustrates a quintessential human desire for connection and understanding through art, which is an element that often contributes to the overall meaning of a story, linking it to larger, universal questions about humanity and self-actualization.