14 You might have found a resemblance in your religion to that of the Pagans as regards Hyle [matter], which the Pagans often speak of. You, on the contrary, maintain that you are directly opposed to them in your belief in the evil principle which your teacher in theology calls Hyle. But here you only show your ignorance, and, with an affectation of learning, use this word without knowing what it means. The Greeks, when speaking of nature, give the name Hyle to the subject-matter of things, which has no form of its own, but admits of all bodily forms, and is known only through these changeable phenomena, not being itself an object of sensation or perception.
Some Gentiles, indeed, erroneously make this matter co-eternal with God, as not being derived from Him, though the bodily forms are. In this manifest error you resemble the Pagans, for you hold that Hyle has a principle of its own, and does not come from God. It is only ignorance that leads you to deny this resemblance. In saying that Hyle has no form of its own, and can take its forms only from God, the Pagans come near to the truth which we believe in contradistinction from your errors.
Not knowing what Hyle or the subject-matter of things is, you make it the race of darkness, in which you place not only innumerable bodily forms of five different kinds, but also a formative mind. Such, indeed, is your ignorance or insanity, that you call this mind Hyle, and make it give forms instead of taking them. If there were such a formative mind as you speak of, and bodily elements capable of form, the word Hyle would properly be applicable to the bodily elements, which would be the matter to be formed by the mind, which you make the principle of evil.
Even this would not be a quite accurate use of the word Hyle, which has no form of any kind; whereas these elements, although capable of new forms, have already the form of elements, and belong to different kinds. Still this use of the word would not be so much amiss, notwithstanding your ignorance; for it would thus be applied, as it properly is, to that which takes form, and not to that which gives it. Even here, however, your folly and impiety would appear in tracing so much that is good to the evil principle, from your not knowing that all natures of every kind, all forms in their proportion, and all weights in their order, can come only from the Father, the Son, and the Holy Spirit.
As it is, you know neither what Hyle is, nor what evil is. Would that I could persuade you to refrain from misleading people still more ignorant than yourselves!
Source: Reply to Faustus the Manichaean (New Advent)