In an early dialogue of Plato's, the Protagoras, Socrates asks Protagoras why it is not as easy to find teachers of virtue as it is to find teachers of swordsmanship, riding, or any other art. Protagoras' answer is that there are no special teachers of virtue, because virtue is taught by the whole community. Plato and Aristotle both accept the view of moral education implied in this answer. In a passage of the Republic (492 b) Plato repudiates the notion that the sophists have a corrupting moral influence upon young men. The public themselves, he says, are the real sophists and the most complete and thorough educators. No private education can hold out against the irresistible force of public opinion and the ordinary moral standards of society. But that makes it all the more essential that public opinion and social environment should not be left to grow up at haphazard as they ordinarily do, but should be made by the wise legislator the expression of the good and be informed in all their details by his knowledge. The legislator is the only possible teacher of virtue.
Such a programme for a treatise on government might lead us to expect in the Politics mainly a description of a Utopia or ideal state which might inspire poets or philosophers but have little direct effect upon political institutions. Plato's Republic is obviously impracticable, for its author had turned away in despair from existing politics. He has no proposals, in that dialogue at least, for making the best of things as they are. The first lesson his philosopher has to learn is to turn away from this world of becoming and decay, and to look upon the unchanging eternal world of ideas. Thus his ideal city is, as he says, a pattern laid up in heaven by which the just man may rule his life, a pattern therefore in the meantime for the individual and not for the statesman. It is a city, he admits in the Laws, for gods or the children of gods, not for men as they are.
Aristotle has none of the high enthusiasm or poetic imagination of Plato. He is even unduly impatient of Plato's idealism, as is shown by the criticisms in the second book. But he has a power to see the possibilities of good in things that are imperfect, and the patience of the true politician who has learned that if he would make men what they ought to be, he must take them as he finds them. His ideal is constructed not of pure reason or poetry, but from careful and sympathetic study of a wide range of facts. His criticism of Plato in the light of history, in Book II. chap, v., though as a criticism it is curiously inept, reveals his own attitude admirably: "Let us remember that we should not disregard the experience of ages; in the multitude of years, these things, if they were good, would certainly not have been unknown; for almost everything has been found out, although sometimes they are not put together; in other cases men do not use the knowledge which they have." Aristotle in his Constitutions had made a study of one hundred and fifty-eight constitutions of the states of his day, and the fruits of that study are seen in the continual reference to concrete political experience, which makes the Politics in some respects a critical history of the workings of the institutions of the Greek city state. In Books IV., V., and VI. the ideal state seems far away, and we find a dispassionate survey of imperfect states, the best ways of preserving them, and an analysis of the causes of their instability. It is as though Aristotle were saying: "I have shown you the proper and normal type of constitution, but if you will not have it and insist on living under a perverted form, you may as well know how to make the best of it." In this way the Politics, though it defines the state in the light of its ideal, discusses states and institutions as they are. Ostensibly it is merely a continuation of the Ethics, but it comes to treat political questions from a purely political standpoint.
This combination of idealism and respect for the teachings of experience constitutes in some ways the strength and value of the Politics, but it also makes it harder to follow. The large nation states to which we are accustomed make it difficult for us to think that the state could be constructed and modelled to express the good life. We can appreciate Aristotle's critical analysis of constitutions, but find it hard to take seriously his advice to the legislator. Moreover, the idealism and the empiricism of the Politics are never really reconciled by Aristotle himself.
It may help to an understanding of the Politics if something is said on those two points.
We are accustomed since the growth of the historical method to the belief that states are "not made but grow," and are apt to be impatient with the belief which Aristotle and Plato show in the powers of the lawgiver. But however true the maxim may be of the modern nation state, it was not true of the much smaller and more self-conscious Greek city. When Aristotle talks of the legislator, he is not talking in the air. Students of the Academy had been actually called on to give new constitutions to Greek states. For the Greeks the constitution was not merely as it is so often with us, a matter of political machinery. It was regarded as a way of life. Further, the constitution within the framework of which the ordinary process of administration and passing of decrees went on, was always regarded as the work of a special man or body of men, the lawgivers. If we study Greek history, we find that the position of the legislator corresponds to that assigned to him by Plato and Aristotle. All Greek states, except those perversions which Aristotle criticises as being "above law," worked under rigid constitutions, and the constitution was only changed when the whole people gave a commission to a lawgiver to draw up a new one. Such was the position of the AEsumnetes, whom Aristotle describes in Book III. chap, xiv., in earlier times, and of the pupils of the Academy in the fourth century. The lawgiver was not an ordinary politician. He was a state doctor, called in to prescribe for an ailing constitution. So Herodotus recounts that when the people of Cyrene asked the oracle of Delphi to help them in their dissensions, the oracle told them to go to Mantinea, and the Mantineans lent them Demonax, who acted as a "setter straight" and drew up a new constitution for Cyrene. So again the Milesians, Herodotus tells us, were long troubled by civil discord, till they asked help from Paros, and the Parians sent ten commissioners who gave Miletus a new constitution. So the Athenians, when they were founding their model new colony at Thurii, employed Hippodamus of Miletus, whom Aristotle mentions in Book II, as the best expert in town-planning, to plan the streets of the city, and Protagoras as the best expert in law-making, to give the city its laws. In the Laws Plato represents one of the persons of the dialogue as having been asked by the people of Gortyna to draw up laws for a colony which they were founding. The situation described must have occurred frequently in actual life. The Greeks thought administration should be democratic and law-making the work of experts. We think more naturally of law-making as the special right of the people and administration as necessarily confined to experts.
Aristotle's Politics, then, is a handbook for the legislator, the expert who is to be called in when a state wants help. We have called him a state doctor. It is one of the most marked characteristics of Greek political theory that Plato and Aristotle think of the statesman as one who has knowledge of what ought to be done, and can help those who call him in to prescribe for them, rather than one who has power to control the forces of society. The desire of society for the statesman's advice is taken for granted, Plato in the Republic says that a good constitution is only possible when the ruler does not want to rule; where men contend for power, where they have not learnt to distinguish between the art of getting hold of the helm of state and the art of steering, which alone is statesmanship, true politics is impossible.
With this position much that Aristotle has to say about government is in agreement. He assumes the characteristic Platonic view that all men seek the good, and go wrong through ignorance, not through evil will, and so he naturally regards the state as a community which exists for the sake of the good life. It is in the state that that common seeking after the good which is the profoundest truth about men and nature becomes explicit and knows itself. The state is for Aristotle prior to the family and the village, although it succeeds them in time, for only when the state with its conscious organisation is reached can man understand the secret of his past struggles