Having laid this sure foundation in the differentiating element of man, the philosopher might naturally have proceeded to prove that, assuming man to be naturally a social animal, and widowed with those instincts which make social organization necessary to his normal existence, any application of reason to social existence, that is, every assertion of practical reason in a creature so constituted, is what we call {153} right, and every omission to assert it, or direct assertion of the contrary, is what we call wrong. A right action is an action according to the real constitution of things, which reality it is the business of reason to discern; a wrong act is an act in contravention of the real constitution of things, and can be performed only when reason is undeveloped or asleep, or by some violent impulse or blind illusion led astray: it is an act insulated, contumacious, and rebellious, issuing necessarily in confusion and chaos and ruin; for no single unit in a complex whole can assert its mere capricious independent self in practical denial of the totality to which it belongs, without producing discomfort at first, and ultimately being crushed by the firm compactness of the mighty machinery which it has recklessly dared to disturb. How this might have been demonstrated in detail the reader of the preceding discourse on Socrates cannot be ignorant; but however much it lay in his way, the Stagirite in his Nicomachean treatise did not choose to enter upon this theme. For this procedure he may have had two sufficient reasons; for, in the first place, he may have thought that view of the matter lay too obviously in the whole scheme and handling both of Plato and Socrates, to be susceptible of much novelty at his hands; and in the second place, he may have considered such a demonstration, however cogent in a book, to be less practically useful than some test of right and wrong, which he might be able to formulate. And in the test which he hits upon, as we shall presently see, it is quite evident that practical utility rather than theoretic invulnerability was his main object; and this is precisely what, in consistency at once with the nature of the {154} subject, and his own introductory observations, he was directly led to do. His test was simply this, that virtue, or right conduct, is generally found in the mean between two extremes; for though there may be the same difficulty in pronouncing about the quality of particular actions, sometimes, as there is in pronouncing about the state of bodily health in any individual, yet, upon a broad view of both cases, nothing seems more obvious and more certain than that the unhealthy condition, whether of body or soul, is chiefly indicated by some deficiency or excess. In other words, virtue is a medium, a balance, a proportion, a symmetry, a harmony, a nice adjustment of the force of each part in reference to the calculated action of the whole. Now, it