We have seen how Prodicus and Hippias professed to teach all science, all literature, and all virtuous accomplishments. We have seen how Protagoras rejected every kind of knowledge unconnected with social culture. We now find Gorgias going a step further. In his later years, at least, he professes to teach nothing but rhetoric or the art of persuasion. We say in his later years, for at one time he seems to have taught ethics and psychology as well.73 But the Gorgias of Plato’s famous dialogue limits himself to the power of producing persuasion by words on all possible subjects, even those of whose details he is ignorant. Wherever the rhetorician comes into competition with the professional he will beat him on his own ground, and will be preferred to him for every public office. The type is by no means extinct, and flourishes like a green bay-tree among ourselves. Like Pendennis, a writer of this kind will review any book from the height of superior knowledge acquired by two hours’ reading in the British Museum; or, if he is adroit enough, will dispense with even that slender amount of preparation. He need not even trouble himself to read the book which he criticises. A superficial acquaintance with magazine articles will qualify him to pass judgment on all life, all religion, and all philosophy. But it is in politics that the finest career lies before him. He rises to power by attacking the measures of real statesmen, and remains there by adopting them. He becomes Chancellor of the Exchequer by gross economical blundering, and Prime Minister by a happy mixture of epigram and adulation.
Rhetoric conferred even greater power in old Athens than in modern England. Not only did mastery of expression lead to public employment; but also, as every citizen was permitted by law to address his assembled fellow-countrymen and propose measures for their acceptance, it became a direct passport to supreme political authority. Nor was this all. At Athens the employment of professional advocates was not allowed, and it was easy to prosecute an enemy on the most frivolous pretexts. If the defendant happened to be wealthy, and if condemnation involved a loss of property, there was a prejudice against him in the minds of the jury, confiscation being regarded as a convenient resource for replenishing the national exchequer. Thus the possession of rhetorical ability became a formidable weapon in the hands of unscrupulous citizens, who were enabled to extort large sums by the mere threat of putting rich men on their trial for some real or pretended offence. This systematic employment of rhetoric for purposes of self-aggrandisement bore much the same relation to the teaching of Protagoras and Gorgias as the open and violent seizure of supreme power on the plea of natural superiority bore to the theories of their rivals, being the way in which practical men applied the principle that truth is determined by persuasion. It was also attended by considerably less danger than a frank appeal to the right of the stronger, so far at least as the aristocratic party were concerned. For they had been taught a lesson not easily forgotten by the downfall of the oligarchies established in 411 and 404; and the second catastrophe especially proved that nothing but a popular government was possible in Athens. Accordingly, the nobles set themselves to study new methods for obtaining their ultimate end, which was always the possession of uncontrolled power over the lives and fortunes of their fellow-citizens. With wealth to purchase instruction from the Sophists, with leisure to practise oratory, and with the ability often accompanying high birth, there was no reason why the successors of Charmides and Critias should not enjoy all the pleasures of tyranny unaccompanied by any of its drawbacks. Here, again, a parallel suggests itself between ancient Greece and modern Europe. On the Continent, where theories of natural law are far more prevalent than with us, it is by brute force that justice is trampled down: the one great object of every ambitious intriguer is to possess himself of the military machine, his one great terror, that a stronger man may succeed in wresting it from him; in England the political adventurer looks to rhetoric as his only resource, and at the pinnacle of power has to dread the hailstorm of epigrammatic invective directed against him by abler or younger rivals.74
Besides its influence on the formation and direction of political eloquence, the doctrine professed by Protagoras had a far-reaching effect on the subsequent development of thought. Just as Cynicism was evolved from the theory of Hippias, so also did the teaching which denied Nature and concentrated all study on subjective phenomena, with a tendency towards individualistic isolation, lead on to the system of Aristippus. The founder of the Cyrenaic school is called a Sophist by Aristotle, nor can the justice of the appellation be doubted. He was, it is true, a friend and companion of Socrates, but intellectually he is more nearly related to Protagoras. Aristippus rejected physical studies, reduced all knowledge to the consciousness of our own sensations, and made immediate gratification the end of life. Protagoras would have objected to the last principle, but it was only an extension of his own views, for all history proves that Hedonism is constantly associated with sensationalism. The theory that knowledge is built up out of feelings has an elective affinity for the theory that action is, or ought to be, determined in the last resort by the most prominent feelings, which are pleasure and pain. Both theories have since been strengthened by the introduction of a new and more ideal element into each. We have come to see that knowledge is constituted not by sensations alone, but by sensations grouped according to certain laws which seem to be inseparable from the existence of any consciousness whatever. And, similarly, we have learned to take into account, not merely the momentary enjoyments of an individual, but his whole life’s happiness as well, and not his happiness only, but also that of the whole community to which he belongs. Nevertheless, in both cases it is rightly held that the element of feeling preponderates, and the doctrines of such thinkers as J. S. Mill are legitimately traceable through Epicurus and Aristippus to Protagoras as their first originator.
Notwithstanding the importance of this impulse, it does not represent the whole effect produced by Protagoras on philosophy. His eristic method was taken up by the Megaric school, and at first combined with other elements borrowed from Parmenides and Socrates, but ultimately extricated from them and used as a critical solvent of all dogmatism by the later Sceptics. From their writings, after a long interval of enforced silence, it passed over to Montaigne, Bayle, Hume, and Kant, with what redoubtable consequences to received opinions need not here be specified. Our object is simply to illustrate the continuity of thought, and the powerful influence exercised by ancient Greece on its subsequent development.
Every variety of opinion current among the Sophists reduces itself, in the last analysis, to their fundamental antithesis between Nature and Law, the latter being somewhat ambiguously conceived by its supporters as either human reason or human will, or more generally as both together, combining to assert their self-dependence and emancipation from external authority. This antithesis was prefigured in the distinction between Chthonian and Olympian divinities. Continuing afterwards to inspire the rivalry of opposing schools, Cynic against Cyrenaic, Stoic against Epicurean, Sceptic against Dogmatist, it was but partially overcome by the mediatorial schemes of Socrates and his successors. Then came Catholicism, equally adverse to the pretensions of either party, and held them