For a Monarchy readily becomes a Tyranny, an Aristocracy an Oligarchy, while a Democracy tends to degenerate into Anarchy. So that if the founder of a State should establish any one of these three forms of Government, he establishes it for a short time only, since no precaution he may take can prevent it from sliding into its contrary, by reason of the close resemblance which, in this case, the virtue bears to the vice.

Republics decline into democracies and democracies degenerate into despotisms.

[A]ristocracy has a tendency to degenerate the human species.

Hence I think it is that democracies change into aristocracies, and these at length into monarchies,' people at last prefer tyranny to chaos. Equality of power is an unstable condition; men are by nature unequal; and 'he who seeks equality between unequals seeks an absurdity.' Democracy has still to solve the problem of enlisting the best energies of men while giving to all alike the choice of those, among the trained and fit, by whom they wish to be ruled.

Oligarchies have generally sprung from the ruins either of monarchy or of democracy. When supreme power falls into the hands of a weak sovereign, the great nobles encroach upon the prerogatives of the monarch. In democracies particular families or individuals acquire, by their talents, their wealth, or their virtues, an influence which loses its original character of responsibility, and becomes permanent and self-dependent.

Hypothesis:
On a long enough timescale, any political system without freedom of speech degenerates towards tyranny.

I do not say that democracy has been more pernicious on the whole, and in the long run, than monarchy or aristocracy. Democracy has never been and never can be so durable as aristocracy or monarchy; but while it lasts, it is more bloody than either. … Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There never was a democracy yet that did not commit suicide. It is in vain to say that democracy is less vain, less proud, less selfish, less ambitious, or less avaricious than aristocracy or monarchy. It is not true, in fact, and nowhere appears in history. Those passions are the same in all men, under all forms of simple government, and when unchecked, produce the same effects of fraud, violence, and cruelty. When clear prospects are opened before vanity, pride, avarice, or ambition, for their easy gratification, it is hard for the most considerate philosophers and the most conscientious moralists to resist the temptation. Individuals have conquered themselves. Nations and large bodies of men, never.

Whenever kingship approaches tyranny it is near its end, for by this it becomes ripe for division, change of dynasty, or total destruction, especially in a temperate climate … where men are habitually, morally and naturally free.

Tyranny […] is essentially informal and unstable. At least in the modern era, they tend to evolve into juntas, which tend to evolve into oligarchies, which tend to evolve into democracies. […] With each of these steps, legitimacy and internal security increase, and the state becomes stronger and harder to overthrow. Unless Gaza is your idea of fun, a strong and secure state is a good thing.

The nation, so long a victim of monarchical selfishness, thought to deliver itself for ever by declaring that it alone was sovereign. But what was monarchy? The sovereignty of one man. What is democracy? The sovereignty of the nation, or, rather, of the national majority. But it is, in both cases, the sovereignty of man instead of the sovereignty of the law, the sovereignty of the will instead of the sovereignty of the reason; in one word, the passions instead of justice. Undoubtedly, when a nation passes from the monarchical to the democratic state, there is progress, because in multiplying the sovereigns we increase the opportunities of the reason to substitute itself for the will; but in reality there is no revolution in the government, since the principle remains the same. Now, we have the proof to-day that, with the most perfect democracy, we cannot be free.

A democracy without values easily turns into open or thinly disguised totalitarianism.

A state too expensive in itself, or by virtue of its dependencies, ultimately falls into decay; its free government is transformed into a tyranny; it disregards the principles which it should preserve, and finally degenerates into despotism.

For tyranny is a kind of monarchy which has in view the interest of the monarch only; oligarchy has in view the interest of the wealthy; democracy of the needy: none of them common good of all.

There are three kinds of constitution, and an equal number of deviation-forms — perversions, as it were, of them. The constitutions are monarchy, aristocracy, and thirdly that which is based on a property qualification, which it seems appropriate to call timocratic, though most people are wont to call it polity. The best of these is monarchy, the worst timocracy. The deviation from monarchy is tyranny; for both are forms of one-man rule, but there is the greatest difference between them; the tyrant looks to his own advantage, the king to that of his subjects. For a man is not a king unless he is sufficient to himself and excels his subjects in all good things; and such a man needs nothing further; therefore he will not look to his own interests but to those of his subjects; for a king who is not like that would be a mere titular king. Now tyranny is the very contrary of this; the tyrant pursues his own good. And it is clearer in the case of tyranny that it is the worst deviation-form; but it is the contrary of the best that is worst. Monarchy passes over into tyranny; for tyranny is the evil form of one-man rule and the bad king becomes a tyrant. Aristocracy passes over into oligarchy by the badness of the rulers, who distribute contrary to equity what belongs to the city-all or most of the good things to themselves, and office always to the same people, paying most regard to wealth; thus the rulers are few and are bad men instead of the most worthy. Timocracy passes over into democracy; for these are coterminous, since it is the ideal even of timocracy to be the rule of the majority, and all who have the property qualification count as equal. Democracy is the least bad of the deviations;