* From a lesser-known poem: It could be from an obscure poet or a work that hasn't gained widespread popularity.
* Part of a larger work: The line might be part of a longer poem, short story, or other literary piece.
* A misremembered line: It's possible the line is slightly different from the original or that you're remembering it incorrectly.
To help you find the poem you're looking for, it would be helpful to know:
* The context of the line: Where did you encounter it? (book, website, etc.)
* The author or title: Do you recall the poet or the name of the work?
* Other lines from the poem: Can you remember any other lines that were near it?
With more information, it might be possible to track down the source of the line.