Aristotle: A Treatise on Government

BOOK III 12. CHAPTER XII

Since in every art and science the end aimed at is always good, so particularly in this, which is the most excellent of all, the founding of civil society, the good wherein aimed at is justice; for it is this which is for the benefit of all. Now, it is the common opinion, that justice is a certain equality; and in this point all the philosophers are agreed when they treat of morals: for they say what is just, and to whom; and that equals ought to receive equal: but we should know how we are to determine what things are equal and what unequal; and in this there is some difficulty, which calls for the philosophy of the politician. Some persons will probably say, that the employments of the state ought to be given according to every particular excellence of each citizen, if there is no other difference between them and the rest of the community, but they are in every respect else alike: for justice attributes different things to persons differing from each other in their character, according to their respective merits. But if this is admitted to be true, complexion, or height, or any such advantage will be a claim for a greater share of the public rights. But that this is evidently absurd is clear from other arts and sciences; for with respect to musicians who play on the flute together, the best flute is not given to him who is of the best family, for he will play never the better for that, but the best instrument ought to be given to him who is the best artist.