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THREE:Such arguments have almost the air of an afterthought, and Plato was perhaps more powerfully swayed by other considerations, which we shall now proceed to analyse. When pleasure was assumed to be the highest good, knowledge was agreed to be the indispensable means for its attainment; and, as so often happens, the means gradually substituted itself for the end. Nor was this all; for knowledge (or reason) being not only the means but the supreme arbiter, when called on to adjudicate between conflicting claims, would naturally pronounce in its own favour. Naturally, also, a moralist who made science the chief interest of his own life would come to believe that it was the proper object of all227 life, whether attended or not by any pleasurable emotion. And so, in direct opposition to the utilitarian theory, Plato declares at last that to brave a lesser pain in order to escape from a greater, or to renounce a lesser pleasure in order to secure a greater, is cowardice and intemperance in disguise; and that wisdom, which he had formerly regarded as a means to other ends, is the one end for which everything else should be exchanged.139 Perhaps it may have strengthened him in this attitude to observe that the many, whose opinion he so thoroughly despised, made pleasure their aim in life, while the fastidious few preferred knowledge. Yet, after a time, even the latter alternative failed to satisfy his restless spirit. For the conception of knowledge resolved itself into the deeper conceptions of a knowing subject and a known object, the soul and the universe, each of which became in turn the supreme ideal. What interpretation should be given to virtue depended on the choice between them. According to the one view it was a purification of the higher principle within us from material wants and passions. Sensual gratifications should be avoided, because they tend to degrade and pollute the soul. Death should be fearlessly encountered, because it will release her from the restrictions of bodily existence. But Plato had too strong a grasp on the realities of life to remain satisfied with a purely ascetic morality. Knowledge, on the objective side, brought him into relation with an organised universe where each individual existed, not for his own sake but for the sake of the whole, to fulfil a definite function in the system of which he formed a part. And if from one point of view the soul herself was an absolutely simple indivisible substance, from another point of view she reflected the external order, and only fulfilled the law of her being when each separate faculty was exercised within its appropriate sphere.For pulleys, gear wheels, or other standard parts of machinery which are not likely to be modified or changed, iron patterns are preferable; patterns for gear wheels and pulleys, when made of wood, aside from their liability to spring and warp, cannot be made sufficiently strong to withstand foundry use; besides, the greatest accuracy that can be attained, even by metal patterns, is far from producing true castings, especially for tooth wheels. The more perfect patterns are, the less rapping is required in drawing them; and the less rapping done, the more perfect castings will be.