What mystic meaning, it may be asked, is contained in such things as a brick, a house, a hat, a pair of shoes? A brick is the ultimate atom of a building; a house is the larger body which man makes for his uses, just as the Self has built its habitation of flesh and bones; hat and shoes are felt and leather insulators with which we seek to cut ourselves off from the currents which flow through earth and air from God. It may be objected that these answers only substitute for the lesser symbol a greater, but this is inevitable: if for the greater symbol were named one still more abstract and inclusive, the ultimate verity would be as far from affirmation as before. There is nothing of which the human mind can conceive that is not a symbol of something greater and higher than itself. The dictionary defines a symbol as "something that stands for something else and serves to represent it, or to bring to mind one or more of its qualities." Now this world is a _reflection_ of a higher world, and that of a higher world still, and so on. Accordingly, everything is a symbol of something higher, since by reflecting, it "stands for, and serves to represent it," and the thing symbolized, being itself a reflection, is, by the same token, itself a symbol. By reiterated repetitions of this reflecting process throughout the numberless planes and sub-planes of nature, each thing becomes a symbol, not of one thing only, but of many things, all intimately correlated, and this gives rise to those underlying analogies, those "secret subterranean passages between matter and soul" which have ever been the especial preoccupation of the poet and the mystic, but which may one day become the subject of serious examination by scientific men. Let us briefly pass in review the various terms of such an ascending series of symbols: members of one family, they might be called, since they follow a single line of descent.