“I have a low opinion of books: they are piles of stones set up to show coming travelers where other minds have been, or at best signal smokes to call attention.” MindHas BeensBookShowsAttentionOpinionLowsStonesSmokeTravelerSignals Book:John of the Mountains: The Unpublished Journals of John Muir Source: John of the Mountains: The Unpublished Journals of John Muir