The final stanza conveys a profound sense of loss and yearning. It suggests a deep nostalgia for a bygone era filled with love and beauty, which now seems distant and elusive. The imagery of the moon in the window serves as a metaphor for a cherished memory or a romantic connection that once brought immense joy and inspiration.
The phrase "seems to have drifted out of a love poem" paints a picture of ethereal beauty slipping away from the speaker's grasp. It implies that what was once vibrant and alive in their life has gradually faded, leaving them with a longing for its return. The moon's presence in the window symbolizes a connection to nature, the night sky, and perhaps even a lost lover.
The mention of the love poem adds another layer of depth to the stanza. It suggests that the speaker was intimately familiar with a poem that encapsulated their feelings of love and longing. However, the phrase "that you used to know by heart" suggests that the poem has faded from their memory, emphasizing the passage of time and the erosion of what was once held dear.
Overall, the final stanza captures the poignant essence of yearning for something that has slipped away. It portrays a wistful longing for the past, for a love that has dimmed, and for the fading beauty of life. The moon, the window, and the love poem intertwine to evoke a sense of nostalgia and elicit a powerful emotional response within the reader.