Do you have an author, or a specific book, you go back to year after year? As a kind of spiritual touchstone for your own work?
I don't. Or rather, at certain times in my life there have been books that I've returned to over and over, but the specific authors or books have changed over the years. At various times it's been work by Andre Norton, Mary Stewart's Merlin trilogy, C.J. Cherryh's Foreigner series...it just depends.
These days I find I don't have quite as much time to do that, I barely have time to read new work and so re-reading has become quite a luxury.