We have next to consider what means there are of preserving constitutions in general, and in particular cases. In the first place it is evident that if we know the causes which destroy constitutions, we also know the causes which preserve them; for opposites produce opposites, and destruction is the opposite of preservation.
In all well-attempered governments there is nothing which should be more jealously maintained than the spirit of obedience to law, more especially in small matters; for transgression creeps in unperceived and at last ruins the state, just as the constant recurrence of small expenses in time eats up a fortune. The expense does not take place at once, and therefore is not observed; the mind is deceived, as in the fallacy which says that ‘if each part is little, then the whole is little.’ this is true in one way, but not in another, for the whole and the all are not little, although they are made up of littles.
In the first place, then, men should guard against the beginning of change, and in the second place they should not rely upon the political devices of which I have already spoken invented only to deceive the people, for they are proved by experience to be useless. Further, we note that oligarchies as well as aristocracies may last, not from any inherent stability in such forms of government, but because the rulers are on good terms both with the unenfranchised and with the governing classes, not maltreating any who are excluded from the government, but introducing into it the leading spirits among them. They should never wrong the ambitious in a matter of honor, or the common people in a matter of money; and they should treat one another and their fellow citizen in a spirit of equality. The equality which the friends of democracy seek to establish for the multitude is not only just but likewise expedient among equals. Hence, if the governing class are numerous, many democratic institutions are useful; for example, the restriction of the tenure of offices to six months, that all those who are of equal rank may share in them. Indeed, equals or peers when they are numerous become a kind of democracy, and therefore demagogues are very likely to arise among them, as I have already remarked. The short tenure of office prevents oligarchies and aristocracies from falling into the hands of families; it is not easy for a person to do any great harm when his tenure of office is short, whereas long possession begets tyranny in oligarchies and democracies. For the aspirants to tyranny are either the principal men of the state, who in democracies are demagogues and in oligarchies members of ruling houses, or those who hold great offices, and have a long tenure of them.
Constitutions are preserved when their destroyers are at a distance, and sometimes also because they are near, for the fear of them makes the government keep in hand the constitution. Wherefore the ruler who has a care of the constitution should invent terrors, and bring distant dangers near, in order that the citizens may be on their guard, and, like sentinels in a night watch, never relax their attention. He should endeavor too by help of the laws to control the contentions and quarrels of the notables, and to prevent those who have not hitherto taken part in them from catching the spirit of contention. No ordinary man can discern the beginning of evil, but only the true statesman.
As to the change produced in oligarchies and constitutional governments by the alteration of the qualification, when this arises, not out of any variation in the qualification but only out of the increase of money, it is well to compare the general valuation of property with that of past years, annually in those cities in which the census is taken annually and in larger cities every third or fifth year. If the whole is many times greater or many times less than when the ratings recognized by the constitution were fixed, there should be power given by law to raise or lower the qualification as the amount is greater or less. Where this is not done a constitutional government passes into an oligarchy, and an oligarchy is narrowed to a rule of families; or in the opposite case constitutional government becomes democracy, and oligarchy either constitutional government or democracy.
It is a principle common to democracy, oligarchy, and every other form of government not to allow the disproportionate increase of any citizen but to give moderate honor for a long time rather than great honor for a short time. For men are easily spoilt; not every one can bear prosperity. But if this rule is not observed, at any rate the honors which are given all at once should be taken away by degrees and not all at once. Especially should the laws provide against any one having too much power, whether derived from friends or money; if he has, he should be sent clean out of the country. And since innovations creep in through the private life of individuals also, there ought to be a magistracy which will have an eye to those whose life is not in harmony with the government, whether oligarchy or democracy or any other. And for a like reason an increase of prosperity in any part of the state should be carefully watched. The proper remedy for this evil is always to give the management of affairs and offices of state to opposite elements; such opposites are the virtuous and the many, or the rich and the poor. Another way is to combine the poor and the rich in one body, or to increase the middle class: thus an end will be put to the revolutions which arise from inequality.
But above all every state should be so administered and so regulated by law that its magistrates cannot possibly make money. In oligarchies special precautions should be used against this evil. For the people do not take any great offense at being kept out of the government- indeed they are rather pleased than otherwise at having leisure for their private business- but what irritates them is to think that their rulers are stealing the public money; then they are doubly annoyed; for they lose both honor and profit. If office brought no profit, then and then only could democracy and aristocracy be combined; for both notables and people might have their wishes gratified. All would be able to hold office, which is the aim of democracy, and the notables would be magistrates, which is the aim of aristocracy. And this result may be accomplished when there is no possibility of making money out of the offices; for the poor will not want to have them when there is nothing to be gained from them- they would rather be attending to their own concerns; and the rich, who do not want money from the public treasury, will be able to take them; and so the poor will keep to their work and grow rich, and the notables will not be governed by the lower class. In order to avoid peculation of the public money, the transfer of the revenue should be made at a general assembly of the citizens, and duplicates of the accounts deposited with the different brotherhoods, companies, and tribes. And honors should be given by law to magistrates who have the reputation of being incorruptible. In democracies the rich should be spared; not only should their property not be divided, but their incomes also, which in some states are taken from them imperceptibly, should be protected. It is a good thing to prevent the wealthy citizens, even if they are willing from undertaking expensive and useless public services, such as the giving of choruses, torch-races, and the like. In an oligarchy, on the other hand, great care should be taken of the poor, and lucrative offices should go to them; if any of the wealthy classes insult them, the offender should be punished more severely than if he had wronged one of his own class. Provision should be made that estates pass by inheritance and not by gift, and no person should have more than one inheritance; for in this way properties will be equalized, and more of the poor rise to competency. It is also expedient both in a democracy and in an oligarchy to assign to those who have less share in the government (i.e., to the rich in a democracy and to the poor in an oligarchy) an equality or preference in all but the principal offices of state. The latter should be entrusted chiefly or only to members of the governing class.
Aristotle: Politics, Book Five, Part 8, 350 B.C.E.