The movement of thought to which I have throughout this book given the name of "the struggle with the objective mystery" remains the same. In these cases, _names_ are of small account. But since it is a movement of thought which itself culminates in the elimination of the "objective mystery," it becomes necessary to "think through" the stage of thought which this term covered, and articulate the actual cause of this movement of the mind. The cause of the spectacle of the universe, as it presents itself to us in its manifold variety, is the presence of innumerable visible bodies which are themselves the manifestation of innumerable invisible souls. Everything that we see and touch and taste and smell and hear is a portion of some material body, which is the expression of some spiritual soul. The universe is an immense congeries of bodies, moved and sustained by an immense congeries of souls. But it remains that these souls, inhabiting these bodies, are linked together by some mysterious medium which makes it possible for them to communicate with one another. What is this mysterious medium? What we have already indicated, here and there in this book, leads us at this point to our natural conclusion. Such a medium may well be nothing less than that elemental soul, with the universal ether as its bodily expression, the existence of which we have already suggested as a more than probable hypothesis. If the omnipresent body of this elemental soul is the material atmosphere or medium which unites all material bodies, surely we are justified in assuming that the invisible primordial medium which binds all souls together, which hypothetically binds them together even _before_ they have, by the interaction of their different visions, created the universe, is this universal "soul of the elements." Only a spiritual substance is able to unite spiritual substances. And only a material substance is able to unite material substances. Thus we are justified in assuming that while the medium which unites all bodies is the universal body of the elemental soul, the medium which unites all souls is the omnipresent soul-monad of this elemental being. It must however be remembered that this uniting does not imply any sort of spiritual _including_ or subsuming of the souls thus united. They communicate with one another by means of this medium; but the integrity of the medium which unites them does not impinge at any point upon their integrity.