When Your Own Writing Comes Back To You

I was emailing an acquaintance today and she attached this image, that was made up by her daughter.
"Have you read this quote?" She asked.

As it turns out, the quote is from my own unpublished S/F/Fantasy novel, THE GODS OF THE GIFT. It's from the page after the title page, where I have set quotes by two fictional writers. Of course I told her of this quote's provenance.  It's weird and ironic, though, to find that something of my writing worked its way via osmosis into the outside world.  No one has ever read this book in its entirety.  Only my partner knows the gist of it.