...of these things, then, as has been said before, it remains for us to determine by what categories and in what order we ought, insofar as it is possible for us to do so, and moreover to the degree to which these things, the present object of our discourse, I mean the previously mentioned ones, allow, as has been said before, to order and categorize these things which were previously mentioned, insofar as they are these things, to the end that we may discourse upon these things not in some arbitrary or unordered way, as though our discourse on these things were a formless mass, as one might, without the discernment necessary to determine how these things might be discussed, whether ordered or unordered or in some third way, in the way given to these things and our discourse by nature or by custom or by some third measure, itself neither the ordering of nature nor that of custom, but either in itself not unordered, though it should seem so to the undiscerning, nor, as has been said before, by nature or custom, but rather that these things which are now the object of previous discourse...

--Aristotle, On Nothing in Particular