Retrieves the given bible chapter from it's on disk location.
        Currently, the location `~/.diyr/<book_name>/` is supported

def _get_ondisk_chapter(self, book_name, book_chapter):
        """
        Retrieves the given bible chapter from it's on disk location.
        Currently, the location `~/.diyr/<book_name>/` is supported
        """
        # First attempt to look up the chapter on the disk
        verses_list = []
        filename = os.path.expanduser("~/.diyr/{}/{}").format(
            book_name,
            book_chapter)
        if os.path.isfile(filename):
            # Read the file into a list
            try:
                f = open(filename)
            except OSError as e:
                logging.error("Could not read {}".format(filename))
                return ["ERROR! Could not read {}".format(filename)]

            for line in f.readlines():
                verses_list.append(line)

            return verses_list
        else:
            # If the file is not cached, raise an Exception
            raise Exception("The file {} is not cached!".format(filename))