There is, however, a genuine distinction between "this" world and the "other" world, which is merely parodied by the vulgar antitheses between natural and supernatural, finite and infinite, phenomenal and noumenal. We sometimes hear it said, "The world is quite changed to me since I knew such a person," or "studied such a subject," or "had suggested to me such an idea." The expression may be literally true; and we do not commonly exaggerate, but vastly underrate its import. We read, for instance, in a good authority, "These twenty kinds of birds (which Virgil mentions) do not correspond so much to our species as to our genera; for the Greeks and Romans, I need hardly say, had only very rough-and-ready methods of classification, just as is the case with uneducated people at the present day."[8] Any one may verify the same fact as regards the observation of flowers. Every yellow ranunculus is called a "butter-cup," every large white umbellifer a "hemlock." These, with hundreds of other differences of perception, affect the surroundings in which men consciously live, at least as much as a considerable degree of deafness or blindness. It is no metaphor, but literal fact, to say that man's whole environment is transformed by the training even of his mere apprehension of natural objects. But there is more in the matter than this. Without going into metaphysics, which I wish to avoid, I cannot, indeed, maintain that mind "makes" natural objects, although by enabling us to perceive them it unquestionably makes our immediate conscious world. My individual consciousness does not make or create the differences between the species of ranunculus, although it does create my knowledge of them. But when we come to speak of the world of morals or art or politics, we may venture much further in our assertions. The actual facts of this world do directly arise out of and are causally sustained by conscious intelligence; and these facts form the world above sense. The unity of a Christian church or congregation is a governing fact of life; so is that of a family or a nation; so, we may hope, will that of humanity come to be. What is this unity? Is it visible and tangible, like the unity of a human body? No, the unity is "ideal;" that is, it exists in the medium of thought only; it is made up of certain sentiments, purposes, and ideas. What even of an army? Here, too, an ideal unity is the mainspring of action. Without mutual intelligence and reciprocal reliance you may have a mob, but you cannot have an army. But all these conditions exist and can exist in the mind only. An army, _qua_ army, is not a mere fact of sense; for not only does it need mind to perceive it--a heap of sand does that--but it also needs mind to _make_ it.