FORE:The substantial forms of Aristotle, combining as they do the notion of a definition with that of a moving cause and a fulfilled purpose, are evidently derived from the Platonic Ideas; a reflection which at once leads us to consider the relation in which he stands to the spiritualism of Plato and to the mathematical idealism of the Neo-Pythagoreans. He agrees with them in thinking that general conceptions are the sole object of knowledgethe sole enduring reality in a world of change. He differs from them in maintaining that such conceptions have no existence apart from the particulars in which they reside. It has been questioned whether Aristotle ever really understood his masters teaching on the subject. Among recent critics, M. Barthlemy Saint-Hilaire asserts,336 with considerable vehemence, that he did not. It is certain that in some respects Aristotle is not just to the Platonic theory, that he exaggerates its absurdities, ignores its developments, and occasionally brings charges against it which might be retorted with at least equal effect against his own philosophy. But on the most important point of all, whether Plato did or did not ascribe a separate existence to his Ideas, we could hardly believe a disciple of twenty years standing229 to be mistaken, even if the master had not left on record a decisive testimony to the affirmative side in his Parmenides, and one scarcely less decisive in his Timaeus.230 And so far as the controversy reduces itself to this particular issue, Aristotle is entirely right. His most powerful arguments are not, indeed, original, having been anticipated by Plato himself; but as they were left unanswered he had a perfect right to repeat them, and his dialectical skill was great enough to make him independent of their support. The extreme minuteness of his criticism is wearisome to us, who can hardly conceive how another opinion could ever have been held. Yet such was the fascination exercised by Platos idealism, that not only was it upheld with considerable acrimony by his immediate followers,231 but under one form or another it has been revived over and over again, in the long period which has elapsed since its first promulgation, and on every one of these occasions the arguments of Aristotle have been raised up again to meet it, each time with triumphant success. Ockhams razor, Entia non sunt sine necessitate multiplicanda, is borrowed from the Metaphysics; Lockes principal objection to innate ideas closely resembles the sarcastic observation in337 the last chapter of the Posterior Analytics, that, according to Platos theory, we must have some very wonderful knowledge of which we are not conscious.232 And the weapons with which Trendelenburg and others have waged war on Hegel are avowedly drawn from the Aristotelian arsenal.233From the time of Socrates on, the majority of Greeks, had they been asked what was the ultimate object of endeavour, or what made life worth living, would have answered, pleasure. But among professional philosophers such a definition of the60 supreme good met with little favour. Seeing very clearly that the standard of conduct must be social, and convinced that it must at the same time include the highest good of the individual, they found it impossible to believe that the two could be reconciled by encouraging each citizen in the unrestricted pursuit of his own private gratifications. Nor had such an idea as the greatest happiness of the greatest number ever risen above their horizon; although, from the necessities of life itself, they unconsciously assumed it in all their political discussions. The desire for pleasure was, however, too powerful a motive to be safely disregarded. Accordingly we find Socrates frequently appealing to it when no other argument was likely to be equally efficacious, Plato striving to make the private satisfaction of his citizens coincide with the demands of public duty, and Aristotle maintaining that this coincidence must spontaneously result from the consolidation of moral habits; the true test of a virtuous disposition being, in his opinion, the pleasure which accompanies its exercise. One of the companions of Socrates, Aristippus the Cyrenaean, a man who had cut himself loose from every political and domestic obligation, and who was remarkable for the versatility with which he adapted himself to the most varying circumstances, went still further. He boldly declared that pleasure was the sole end worth seeking, and on the strength of this doctrine came forward as the founder of a new philosophical school. According to his system, the summum bonum was not the total amount of enjoyment secured in a lifetime, but the greatest single enjoyment that could be secured at any moment; and this principle was associated with an idealistic theory of perception, apparently suggested by Protagoras, but carrying his views much further. Our knowledge, said Aristippus, is strictly limited to phenomena; we are conscious of nothing beyond our own feelings; and we have no right to assume the existence of any objects by which they are caused. The study of natural61 science is therefore waste of time; our whole energies should be devoted to the interests of practical life.123 Thus Greek humanism seemed to have found its appropriate sequel in hedonism, which, as an ethical theory, might quote in its favour both the dictates of immediate feeling and the sanction of public opinion.
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