Having established these particulars, we come to consider next the different number of governments which there are, and what they are; and first, what are their excellencies: for when we have determined this, their defects will be evident enough.
It is evident that every form of government or administration, for the words are of the same import, must contain a supreme power over the whole state, and this supreme power must necessarily be in the hands of one person, or a few, or many; and when either of these apply their power for the common good, such states are well governed; but when the interest of the one, the few, or the many who enjoy this power is alone consulted, then ill; for you must either affirm that those who make up the community are not citizens, or else let these share in the advantages of government. We usually call a state which is governed by one person for the common good, a kingdom; one that is governed by more than one, but by a few only, an aristocracy; either because the government is in the hands of the most worthy citizens, or because it is the best form for the city and its inhabitants. When the citizens at large govern for the public good, it is called a state; which is also a common name for all other governments, and these distinctions are consonant to reason; for it will not be difficult to find one person, or a very few, of very distinguished abilities, but almost impossible to meet with the majority [1279b] of a people eminent for every virtue; but if there is one common to a whole nation it is valour; for this is created and supported by numbers: for which reason in such a state the profession of arms will always have the greatest share in the government.
Now the corruptions attending each of these governments are these; a kingdom may degenerate into a tyranny, an aristocracy into an oligarchy, and a state into a democracy. Now a tyranny is a monarchy where the good of one man only is the object of government, an oligarchy considers only the rich, and a democracy only the poor; but neither of them have a common good in view.
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