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TWO:Another matter to be considered is that the engineering apprentice, in estimating what he will have to learn, must not lose sight of the fact that what qualifies an engineer of to-day will fall far short of the standard that another generation will fix, and of that period in which his practice will fall. This I mention because it will have much to do with the conceptions that a [9] learner will form of what he sees around him. To anticipate improvement and change is not only the highest power to which a mechanical engineer can hope to attain, but is the key to his success.Before parting with Stoicism we have to say a few words on the metaphysical foundation of the whole system��the theory of Nature considered as a moral guide and support. It has been shown that the ultimate object of this, as of many other ethical theories, both ancient and modern, was to reconcile the instincts of individual self-preservation with virtue, which is the instinct of self-preservation in an entire community. The Stoics identified both impulses by declaring that virtue is the sole good of the individual no less than the supreme interest of the whole; thus involving themselves in an insoluble contradiction. For, from their nominalistic point of view, the good of the whole can be nothing but an aggre45gate of particular goods, or else a means for their attainment; and in either case the happiness of the individual has to be accounted for apart from his duty. And an analysis of the special virtues and vices would equally have forced them back on the assumption, which they persistently repudiated, that individual existence and pleasure are intrinsically good, and their opposites intrinsically evil. To prove their fundamental paradox��the non-existence of individual as distinguished from social interest��the Stoics employed the analogy of an organised body where the good of the parts unquestionably subserves the good of the whole;100 and the object of their teleology was to show that the universe and, by implication, the human race, were properly to be viewed in that light. The acknowledged adaptation of life to its environment furnished some plausible arguments in support of their thesis; and the deficiencies were made good by a revival of the Heracleitean theory in which the unity of Nature was conceived partly as a necessary interdependence of opposing forces, partly as a perpetual transformation of every substance into every other. Universal history also tended to confirm the same principle in its application to the human race. The Macedonian, and still more the Roman empire, brought the idea of a world-wide community living under the same laws ever nearer to its realisation; the decay of the old religion and the old civic patriotism set free a vast fund of altruism which now took the form of simple philanthropy; while a rank growth of immorality offered ever new opportunities for an indignant protest against senseless luxury and inhuman vice. This last circumstance, however, was not allowed to prejudice the optimism of the system; for the fertile physics of Heracleitus suggested a method by which moral evil could be interpreted as a necessary concomitant of good, a material for the perpetual exercise and illustration of virtuous deeds.101

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