It's a quote from Lord Summerisle (christopher lee) in the movie "the wicker man" (the original, not the remake). Given that nearly every Agalloch song has quotes of the movie in it i suggest you watch it...
Right, Agalloch. I knew I've heard that somewhere before.
Good thing you reminded me about the film. I watched it, say 7-8 years ago - forgot a lot. Will look it up. Thanks man.