None but the Lonely Heart

The speaker feels deeply lonely and separated from someone he loves. He says that ordinary words or people cannot fully understand this sadness. The repeated lines return to the same feeling, while the image of a burning fire suggests that his pain grows intense and consumes his attention.

The “boundless arch” of heaven may mean the wide sky overhead. Its great size makes the distance between the speaker and his loved one feel even more painful. “My senses fail” suggests that grief overwhelms him so much that he struggles to think or experience the world normally. The fire is likely a metaphor for emotional suffering, not a literal flame.

The lyrics express longing, but they do not explain why the two people are apart or whether they will meet again. “None but the lonely heart” can be understood as saying that only someone who has felt similar loneliness can truly recognize this kind of sadness. The repeated refrain may make the speaker sound trapped in grief, though it could also be a way of emphasizing how constant and difficult to share the feeling is.