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TWO:A distinct parallelism may be traced in the lines of evolution along which we have accompanied our two opposing schools. While the Academicians were coming over to the Stoic theory of cognition, the Stoics themselves were moving in the same general direction, and seeking for an external reality more in consonance with their notions of certainty than the philosophy of their first teachers could supply. For, as originally constituted, Stoicism included a large element of scepticism, which must often have laid its advocates open to the charge of inconsistency from those who accepted the same principle in a more undiluted form. The Heracleitean flux adopted by Zeno as the physical basis of his system, was164 much better suited to a sceptical than to a dogmatic philosophy, as the use to which it was put by Protagoras and Plato sufficiently proved; and this was probably the reason why Bothus and Panaetius partially discarded it in favour of a more stable cosmology. The dialectical studies of the school also tended to suggest more difficulties than they could remove. The comprehensive systematisation of Chrysippus, like that of Plato and Aristotle, had for its object the illustration of each topic from every point of view, and especially from the negative as well as from the positive side. The consequence was that his indefatigable erudition had collected a great number of logical puzzles which he had either neglected or found himself unable to solve. There would, therefore, be a growing inclination to substitute a literary and rhetorical for a logical training: and as we shall presently see, there was an extraneous influence acting in the same direction. Finally, the rigour of Stoic morality had been strained to such a pitch that its professors were driven to admit the complete ideality of virtue. Their sage had never shown himself on earth, at least within the historical period; and the whole world of human interests being, from the rational point of view, either a delusion or a failure, stood in permanent contradiction to their optimistic theory of Nature. The Sceptics were quite aware of this practical approximation to their own views, and sometimes took advantage of it to turn the tables on their opponents with telling effect. Thus, on the occasion of that philosophical embassy with an account of which the present chapter began, when a noble Roman playfully observed to Carneades, You must think that I am not a Praetor as I am not a sage, and that Rome is neither a city nor a state, the great Sceptic replied, turning to his colleague Diogenes, That is what my Stoic friend here would say.262 And Plutarch, in two sharp attacks on the Stoics, written from the Academic point of view, and probably165 compiled from documents of a much earlier period,263 charges them with outraging common sense by their wholesale practical negations, to at least as great an extent as the Sceptics outraged it by their suspense of judgment. How the ethical system of Stoicism was modified so as to meet these criticisms has been related in a former chapter; and we have just seen how Posidonius, by his partial return to the Platonic psychology, with its division between reason and impulse, contributed to a still further change in the same conciliatory sense.After eliminating all the sources of misery due to folly and vice, Epicurus had still to deal with what, in his opinion, were the most formidable obstacles to human happiness, dread of the divine anger and dread of death, either in itself, or as the entrance on another life. To meet these, he compiled, for we can hardly say constructed, an elaborate system of physical philosophy, having for its object to show that Nature is entirely governed by mechanical causes, and that the soul perishes with the body. We have already mentioned that for science as such and apart from its ethical applications he neither cared nor pretended to care in the least. It seems, therefore, rather surprising that he could not manage, like the Sceptics before him, to get rid of supernaturalism by a somewhat more expeditious method. The explanation seems to be that to give some account of natural phenomena had become, in his time, a necessity for every one aspiring to found a philosophical system. A brilliant example had been set by Plato and Aristotle, of whom the former, too, had apparently yielded to the popular demand rather than followed the bent of his own genius, in turning aside from ethics to physics; and Zeno had similarly included the whole of knowledge in his teaching. The old Greek curiosity respecting the causes of things was still alive; and a similar curiosity was doubtless awakening among those populations to whom Greek civilisation had been carried by colonisation, commerce, and conquest. Now, those scientific speculations are always the76 most popular which can be shown to have some bearing on religious belief, either in the way of confirmation or of opposition, according as faith or doubt happens to be most in the ascendent. Fifty years ago, among ourselves, no work on natural philosophy could hope for a large circulation unless it was filled with teleological applications. At present, liberal opinions are gaining ground; and those treatises are most eagerly studied which tend to prove that everything in Nature can be best explained through the agency of mechanical causation. At neither period is it the facts themselves which have excited most attention, but their possible bearing on our own interests. Among the contemporaries of Epicurus, the two currents of thought that in more recent times have enjoyed an alternate triumph, seem to have co-existed as forces of about equal strength. The old superstitions were rejected by all thinking men; and the only question was by what new faith they should be replaced. Poets and philosophers had alike laboured to bring about a religious reformation by exhibiting the popular mythology in its grotesque deformity, and by constructing systems in which pure monotheism was more or less distinctly proclaimed. But it suited the purpose, perhaps it gratified the vanity of Epicurus to talk as if the work of deliverance still remained to be done, as if men were still groaning under the incubus of superstitions which he alone could teach them to shake off. He seems, indeed, to have confounded the old and the new faiths under a common opprobrium, and to have assumed that the popular religion was mainly supported by Stoic arguments, or that the Stoic optimism was not less productive of superstitious terrors than the gloomy polytheism which it was designed to supersede.152
