This is going to sound quite odd but I understand it is not an entirely original phenomenon. I am incorporating poems I have written into a novel. One poem in particular features four lines the origin of which I have always questioned. I am not someone with cognitive issues but I continually feel I read them somewhere before writing them. Sounds crazy I know, but when writing they just simply "appeared" with little effort. Further they use more romantic language than Is native to most of my writing. Are they my words or not? I can't reasonably answer that. I certainly hope so but would be horrified to have "kleptomaniacally" stolen someone else's verse!
I have searched high and low to access these lines, to attribute them to an author, with little luck. Any suggestions?