THREE:To get rid of superstitious beliefs was, no doubt, a highly meritorious achievement, but it had been far more effectually57 performed by the great pre-Socratic thinkers, Heracleitus, Empedocles, Anaxagoras, and Democritus. These men or their followers had, besides, got hold of a most important principle��the vital principle of all science��which was the reign of law, the universality and indefeasibility of physical causation. Now, Epicurus expressly refused to accept such a doctrine, declaring that it was even worse than believing in the gods, since they could be propitiated, whereas fate could not.119 Again, Greek physical philosophy, under the guidance of Plato, had been tending more and more to seek for its foundation in mathematics. Mathematical reasoning was seen to be the type of all demonstration; and the best hopes of progress were staked on the extension of mathematical methods to every field of enquiry in turn. How much might be done by following up this clue was quickly seen not only in the triumphs of geometry, but in the brilliant astronomical discoveries by which the shape of the earth, the phases of the moon, and the cause of eclipses were finally cleared up and placed altogether outside the sphere of conjecture. Nor was a knowledge of these truths confined to specialists: they were familiar alike to the older Academy, to the Peripatetic, and to the Stoic schools; so that, with the exception of those who doubted every proposition, we may assume them to have been then, as now, the common property of all educated men. Epicurus, on the other hand, seems to have known nothing of mathematics, or only enough to dispute their validity, for we are told that his disciple Polyaenus, who had previously been eminent in that department, was persuaded, on joining the school, to reject the whole of geometry as untrue;120 while, in astronomy, he pronounced the heavenly bodies to be no larger than they appear to our senses, denied the existence of Antipodes, and put the crudest guesses of early philosophy on the same footing with the best-authenticated results of later observation. It is no wonder, then, that during the whole58 continuance of his school no man of science ever accepted its teaching, with the single exception of Asclepiades, who was perhaps a Democritean rather than a disciple of the Garden, and who, at any rate, as a physiologist, would not be brought into contact with its more flagrant absurdities.The first difficulty that strikes one in connexion with this extraordinary story arises out of the oracle on which it all hinges. Had such a declaration been really made by the Pythia, would not Xenophon have eagerly quoted it as a proof of the high favour in which his hero stood with the113 gods?82 And how could Socrates have acquired so great a reputation before entering on the cross-examining career which alone made him conscious of any superiority over other men, and had alone won the admiration of his fellow-citizens? Our doubts are still further strengthened when we find that the historical Socrates did not by any means profess the sweeping scepticism attributed to him by Plato. So far from believing that ignorance was the common and necessary lot of all mankind, himself included, he held that action should, so far as possible, be entirely guided by knowledge;83 that the man who did not always know what he was about resembled a slave; that the various virtues were only different forms of knowledge; that he himself possessed this knowledge, and was perfectly competent to share it with his friends. We do, indeed, find him very ready to convince ignorant and presumptuous persons of their deficiencies, but only that he may lead them, if well disposed, into the path of right understanding. He also thought that there were certain secrets which would remain for ever inaccessible to the human intellect, facts connected with the structure of the universe which the gods had reserved for their own exclusive cognisance. This, however, was, according to him, a kind of knowledge which, even if it could be obtained, would not be particularly worth having, and the search after which would leave us no leisure for more useful acquisitions. Nor does the Platonic Socrates seem to have been at the trouble of arguing against natural science. The subjects of his elenchus are the professors of such arts as politics, rhetoric, and poetry. Further, we have something stronger than a simple inference from the facts recorded by Xenophon; we have his express testimony to the fact that Socrates did not114 limit himself to confuting people who fancied they knew everything; here we must either have a direct reference to the Apologia, or to a theory identical with that which it embodies.I Some stress has been laid on a phrase quoted by Xenophon himself as having been used by Hippias, which at first sight seems to support Plato��s view. The Elian Sophist charges Socrates with practising a continual irony, refuting others and not submitting to be questioned himself;84 an accusation which, we may observe in passing, is not borne out by the discussion that subsequently takes place between them. Here, however, we must remember that Socrates used to convey instruction under the form of a series of leading questions, the answers to which showed that his interlocutor understood and assented to the doctrine propounded. Such a method might easily give rise to the misconception that he refused to disclose his own particular opinions, and contented himself with eliciting those held by others. Finally, it is to be noted that the idea of fulfilling a religious mission, or exposing human ignorance ad majorem Dei gloriam, on which Grote lays such stress, has no place in Xenophon��s conception of his master, although, had such an idea been really present, one can hardly imagine how it could have been passed over by a writer with whom piety amounted to superstition. It is, on the other hand, an idea which would naturally occur to a great religious reformer who proposed to base his reconstruction of society on faith in a supernatural order, and the desire to realise it here below.