TWO:With regard to ethics, there is, of course, a great difference between the innovating, creative genius of the Greek and the receptive but timid intelligence of the Roman. Yet the uncertainty which, in the one case, was due to the absence of any fixed system, is equally present in the other, owing to the embarrassment of having so many systems among which to choose. Three ethical motives were constantly present to the thoughts of Socrates: the utility of virtue, from a material point of view, to the individual; its social necessity; and its connexion with the dual constitution of man as a being composed of two elements whereof the one is infinitely superior to the other; but he never was able, or never attempted to co-ordinate them under a single principle. His successors tried to discover such a principle in the idea of natural law, but could neither establish nor apply it in a satisfactory manner. Cicero reproduces the Socratic elements, sometimes in their original dispersion and confusion, sometimes with the additional complication and perplexity introduced by the idea through which it had been hoped to systematise and reconcile them. To him, indeed, that idea was even more important than to the Greek moralists; for he looked on Nature as the common ground where philosophy and untrained experience might meet for mutual confirmation and support.274 We have seen how he adopted the theoryas yet not very clearly formulatedof a moral sense, or general faculty of intuition, from Philo. To study and obey the dictates of this faculty, as distinguished from the depraving influence of custom, was his method of arriving at truth and right. But if, when properly consulted, it always gave the same response, a similar unanimity might be expected in the doctrines of the various philosophical schools; and the adhesion of Academicians, Peripatetics, and Stoics to the precept, Follow Nature, seemed to demonstrate that such an agreement actually existed. Hence Cicero over and over again labours to prove173 that their disputes were merely verbal, and that Stoicism in particular had borrowed its ethics wholesale from his own favourite sect. Yet from time to time their discrepancies would force themselves on his notice; and by none have the differences separating Stoicism from its rivals been stated with more clearness, concision, and point.275 These relate to the absolute self-sufficingness of virtue, its unity, and the incompatibility of emotion with its exercise. But Cicero seems to have regarded the theory of preference and rejection as a concession to common sense amounting to a surrender of whatever was parodoxical and exclusive in the Stoic standpoint.276 And with respect to the question round which controversy raged most fiercely, namely, whether virtue was the sole or merely the chief condition of happiness, Cicero, as a man of the world, considered that it was practically of no consequence which side prevailed.277 It would be unfair to blame him for not seeing, what the stricter school felt rather than saw, that the happiness associated with goodness was not of an individual but of a social character, and therefore could not properly be compared with objects of purely individual desire, such as health, wealth, friends, and worldly fame.Designing, or generating the plans of machinery, may be considered the leading element in engineering manufactures or machine construction, that one to which all others are subordinate, [75] both in order and importance, and is that branch to which engineering knowledge is especially directed. Designing should consist, first, in assuming certain results, and, secondly, in conceiving of mechanical agents to produce these results. It comprehends the geometry of movements, the disposition and arrangement of material, the endurance of wearing surfaces, adjustments, symmetry; in short, all the conditions of machine operation and machine construction. This subject will be again treated of at more length in another section.
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ONE:Whether Plotinus was or was not the disciple of Ammonius, it is beyond all doubt that he considered himself the disciple of Plato. There are more than a hundred references to that philosopher in the Enneads, against less than thirty references to all the other ancient thinkers put together;428 and, what is more remarkable, in only about half of them is he mentioned by name. The reader is expected to know that he always means Plato. And it is an article of faith with Plotinus that his master cannot be mistaken; when the words of oracular wisdom seem to contradict one another, there must be some way of harmonising them. When they contradict what he teaches himself, the difficulty must be removed by skilful interpretation; or, better still, it must be discreetly ignored.429 On the other hand, when a principle is palpably borrowed from Aristotle, not only is its derivation unacknowledged, but we are given to understand by implication that it belongs to the system which Aristotle was at most pains to controvert.430
