January 30th. The stumbling-block to most minds is perhaps less the mere existence of the unseen than the want of definition, the apparently hopeless vagueness, and not least, the delight in this vagueness as mere vagueness by some who look upon this as the mark of quality in Spiritual things. It will be at least something to tell earnest seekers that the Spiritual World is not a castle in the air, of an architecture unknown to earth or heaven, but a fair ordered realm furnished with many familiar things and ruled by well-remembered Laws. Natural Law, Introduction, p.26.