Do we mark this as the Witcher? Because that's a direct quote from The Witcher.
Guin admits himself that it was a quote from the Witcher but I'm not too sure if we count quotes as enough material to count as a tagging, especially when it's spread over so many pages.
I think it's better to simply note it as such if anything else and leave it at that for now unless someone more experienced comes across this and gives a definite answer
Paraphrased Quote from The Last Wish from The Witcher series