FORE:The materialism of his dogmatic contemporaries placed them at a terrible disadvantage when the sceptical successor of Plato went on to show that eternal duration is incompatible with whatever we know about the constitution of corporeal substance; and this part of his argument applied as much to the Epicurean as to the Stoic religion.246 But even a spiritualistic monotheism is not safe from his dissolving criticism. According to Carneades, a god without senses has no experience of whatever pleasurable or painful feelings accompany sensation, and is therefore, to that extent, more ignorant than a man; while to suppose that he experiences painful sensations is the same as making him obnoxious to the diminished vitality and eventual death with which they are naturally associated. And, generally speaking, all sensation involves a modification of the sentient subject by an external object, a condition necessarily implying the destructibility of the former by the latter.247 So also, moral goodness is an essentially relative quality, inconceivable without the possibility of succumbing to temptation, which we cannot attribute to a perfect Being.248 In a word, whatever belongs to conscious life being relative and conditioned, personality is excluded from the absolute by its very definition.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.233
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