THE FOUR STOIC CATEGORIES EVAPORATE, LEAVING MATTER ALONE AS BASIS.
If the (Stoics) say that the "reasons" are only modified matter, they then admit that qualities are modes, and the (Stoics) should locate the reasons in the fourth category, of relation. If however relation be something different from modality, in what does that difference consist? Is it that modality here possesses greater reality? But if modality, taken in itself, be not a reality, why then make of it a category? Surely it would be impossible to gather in a single category both essence and non-essence. In what then does this modification of matter consist? It must be either essence or non-essence. If it be essence, it is necessarily incorporeal. If it be non-essence, it is nothing but a word, and matter alone exists. In this case, quality is nothing real, and modality still less. As to the fourth category, relation, absolutely no reality whatever will inhere in it. This Stoic system, therefore, contains nothing else but matter.