@Espiritus_Corvus I’m curious where you found that. The second stanza is lyrics from the old traditional ballad ”Scarborough Fair,” and Fleda Claes Johansson is a fictional character from Gunslinger Girl. There’s an episode of the anime version that revolves around her and uses “Scarborough Fair” as a leitmotif, but she never says the first part in the episode. Perhaps, then, it is from the issue of the manga that the episode is based on.
@SavoirFaire If you mean the quote “May you not… etc.” Claes says it to Triela in the final episode of Gunslinger Girl 2, “IL TEATRINO,” the OAV. I asked the question wondering if anyone famous had said it before her. There have been other sayings similar to it.