Aristotle, Politics

[1253a] [1] and self-sufficiency is an end, and a chief good. From these things therefore it is clear that the city-state is a natural growth, and that man is by nature a political animal, and a man that is by nature and not merely by fortune citiless is either low in the scale of humanity or above it （like the “ clanless, lawless, hearthless
” man reviled by Homer,¹ for one by nature unsocial is also ‘a lover of war’） inasmuch as he is solitary, like an isolated piece at draughts. And why man is a political animal in a greater measure than any bee or any gregarious animal is clear. For nature, as we declare, does nothing without purpose; and man alone of the animals possesses speech. The mere voice, it is true, can indicate pain and pleasure, and therefore is possessed by the other animals as well （for their nature has been developed so far as to have sensations of what is painful and pleasant and to indicate those sensations to one another）, but speech is designed to indicate the advantageous and the harmful, and therefore also the right and the wrong; for it is the special property of man in distinction from the other animals that he alone has perception of good and bad and right and wrong and the other moral qualities, and it is partnership in these things that makes a household and a city-state.

Thus also the city-state is prior in nature to the household and to each of us individually. [20] For the whole must necessarily be prior to the part; since when the whole body is destroyed, foot or hand will not exist except in an equivocal sense, like the sense in which one speaks of a hand sculptured in stone as a hand; because a hand in those circumstances will be a hand spoiled, and all things are defined by their function and capacity, so that when they are no longer such as to perform their function they must not be said to be the same things, but to bear their names in an equivocal sense. It is clear therefore that the state is also prior by nature to the individual; for if each individual when separate is not self-sufficient, he must be related to the whole state as other parts are to their whole, while a man who is incapable of entering into partnership, or who is so self-sufficing that he has no need to do so, is no part of a state, so that he must be either a lower animal or a god.

Therefore the impulse to form a partnership of this kind is present in all men by nature; but the man who first united people in such a partnership was the greatest of benefactors. For as man is the best of the animals when perfected, so he is the worst of all when sundered from law and justice. For unrighteousness is most pernicious when possessed of weapons, and man is born possessing weapons for the use of wisdom and virtue, which it is possible to employ entirely for the opposite ends. Hence when devoid of virtue man is the most unholy and savage of animals, and the worst in regard to sexual indulgence and gluttony. Justice on the other hand is an element of the state; for judicial procedure, which means the decision of what is just, is the regulation of the political partnership.