I have highlighted a cryptic representation of a very well known phrase in the grid. I can trace this to a specific author and publication.
I have not found that precise phrase in a traditional verse though. There are similar words in a verse of a well known song (plus others not in the grid). They do not work as neatly.
Have I missed a song or poem with a verse that works?
No need to share a link or any spoilers. Just let me know if I need to keep looking.