Ralph McInerny  

"I shall omit to speak about genera and species, as to whether they subsist (in the nature of things) or in mere conceptions only; whether also if subsistent, they are bodies or incorporeal, and whether they are separate from, or in, sensibles, and subsist about these, for such a treatise is most profound, and requires another more extensive investigation". --Porphyry on the problem of universals in the Isagoge, translation by Boethius, English translation quoted in A History of Western Philosophy (McInerny and Caponigri), p. 357, Ralph McInerny, ‎Aloysius Robert Caponigri