mind is a more valuable part of man than the body, every one would wish to have those things more regarded in his city which tend to the advantage of these than common matters, such are war and justice; to which may be added council, which is the business of civil wisdom (nor is it of any consequence whether these different employments are filled by different persons or one, as the same man is oftentimes both a soldier and a husbandman): so that if both the judge and the senator are parts of the city, it necessarily follows that the soldier must be so also. The seventh sort are those who serve the public in expensive employments at their own charge: these are called the rich. The eighth are those who execute the different offices of the state, and without these it could not possibly subsist: it is therefore necessary that there should be some persons capable of governing and filling the places in the city; and this either for life or in rotation: the office of senator, and judge, of which we have already sufficiently treated, are the only ones remaining. If, then, these things are necessary for a state, that it may be happy and just, it follows that the citizens who engage in public affairs should be men of abilities therein. [1291b] Several persons think, that different employments may be allotted to the same person; as a soldier's, a husbandman's, and an artificer's; as also that others may be both senators and judges. Besides, every one supposes himself a man of political abilities, and that he is qualified for almost every department in the state. But the same person cannot at once be poor and rich: for which reason the most obvious division of the city is into two parts, the poor and rich; moreover, since for the generality the one are few, the other many, they seem of all the parts of a city most contrary to each other; so that as the one or the other prevail they form different states; and these are the democracy and the oligarchy.