The good of a book lies in its being read. A book is made up of signs that speak of other signs, which in their turn speak of things. Without an eye to read them, a book contains signs that produce no concepts; therefore it is dumb.
Every one knows how the snow lies in the valleys of the Alps, forming a plain which slopes gradually downward towards the outlet Imagine such a valley ten miles across, with just such a sloping plain, not of snow but of earth.