ONE:Aristotles treatise on the soul is mainly devoted to a description of the theoretical facultiessense, and thought or reason. By sense we become acquainted with the material qualities of things; by thought with their forms or ideas. It has been already mentioned that, according to our philosopher, the organism is a system of contrary forces held in equilibrium by the soul, whose seat he supposes to be in the heart. We now learn that every sensation is a disturbance of this equilibrium. In other words, the sensorium being virtually any and every mode of matter, is raised from possibility to actuality by the presence of some one force, such as heat or cold, in sufficient strength to incline the balance that way. Here we have, quite in Aristotles usual style, a description instead of an explanation. The atomic notion of thin films thrown off from the object of sense, and falling on the organs of sight or touch, was but a crude guess; still it has more affinity with the discoveries of a Young or a Helmholtz than scholastic phrases about potentiality and actuality. That sensation implies a disturbance of equilibrium is, indeed, an important truth; only, the equilibrium must be conceived as a balance, not of possible sensations, but of molecular states; that is to say, it must be interpreted according to the atomic theory.Even as regards physical phenomena, Socrates, so far from professing complete ignorance, held a very positive theory which he was quite ready to share with his friends. He taught what is called the doctrine of final causes; and, so far as our knowledge goes, he was either the first to teach it, or, at any rate, the first to prove the existence of divine agencies by its means. The old poets had occasionally attributed the origin of man and other animals to supernatural intelligence, but, apparently, without being led to their conviction by any evidence of design displayed in the structure of organised creatures. Socrates, on the other hand, went through the various external organs of the human body with great minuteness, and showed, to his own satisfaction, that they evinced the workings of a wise and beneficent Artist. We shall have more to say further on about this whole argument; here we only wish to observe that, intrinsically, it does not differ very much from the speculations which its author derided as the fruit of an impertinent curiosity; and that no one who now employed it would, for a single moment, be called an agnostic or a sceptic.
TWO:Utilitarianism agrees with the ancient hedonism in holding pleasure to be the sole good and pain the sole evil. Its adherents also, for the most part, admit that the desire of the one and the dread of the other are the sole motives to action; but, while making the end absolutely universal and impersonal, they make the motive into a momentary impulse, without any necessary relation to the future happiness of the agent himself. The good man does his duty because doing it gives him pleasure, or because the failure to do it would give him pain, at the moment; although he knows that a contrary course would save him from greater pain or win him greater pleasure hereafter. No accurate thinker would call this acting from a selfish or interested motive; nor does it agree with the teaching of Epicurus. Were all sensitive beings to be united in a single organism, then, on utilitarian principles, self-interest, interpreted in the sense of seeking its own preservation and pleasure, would be the only law that the individualised aggregate could rationally obey. But the good of each part would be rigorously subordinated to the good of the whole; and utilitarian morality desires that we should act as if this hypothesis were realised, at least in reference to our own particular interests. Now, the idea of humanity as forming such a consolidated whole is not Epicurean. It belongs to the philosophy which always reprobated pleasure, precisely because its pursuit is associated with the dereliction of public duty and with bitter rivalry for the possession of what, by its very nature, exists only in limited quantities, while the demand for it is unlimited or, at any rate, far exceeds the supply. According to the Stoics, there was only one way in which the individual could study his private425 interest without abandoning his position as a social being, and this was to find it exclusively in the practice of virtue.575 But virtue and public interest remained mere forms scantily supplemented by appeals to the traditional morality, until the idea of generalised happiness, of pleasure diffused through the whole community, came to fill them with substance and life.
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