The Refutation of All Heresies: Book VII. 8Aristotle's Cosmogony; His “Psychology;” His “Entelecheia;” His Theology; His Ethics; Basilides Follows Aristotle.

But concerning Substance, the statements now made will suffice. But not only is Substance denominated genus, species, (and) individual, but also matter, and form, and privation. There is, however, (as regards the substance,) in these no difference, even though the division be allowed to stand. Now, inasmuch as Substance is of this description, the arrangement of the world has taken place according to some such plan as the following. The world is divided, according to Aristotle, into very numerous and diversified parts. Now the portion of the world which extends from the earth to the moon is devoid of foresight, guideless, and is under the sway of that nature alone which belongs to itself. But another (part of the world which lies) beyond the moon, and extends to the surface of heaven, is arranged in the midst of all order and foresight and governance. Now, the (celestial) superficies constitutes a certain fifth substance, and is remote from all those natural elements out of which the cosmical system derives consistence. And this is a certain fifth Substance, according to Aristotle,--as it were, a certain super-mundane essence. And (this essence) has become (a logical necessity) in his system, in order to accord with the (Peripatetic) division of the world. And (the topic of this fifth nature) constitutes a distinct investigation in philosophy. For there is extant a certain disquisition, styled A Lecture on Physical (Phenomena), in which he has elaborately treated concerning the operations which are conducted by nature and not providence, (in the quarter of space extending) from the earth as far as the moon. And there is also extant by him a certain other peculiar treatise on the principles of things (in the region) beyond the moon, and it bears the following inscription: Metaphysics. And another peculiar dissertation has been (written) by him, entitled Concerning a Fifth Substance, and in this work Aristotle unfolds his theological opinions.

There exists some such division of the universe as we have now attempted to delineate in outline, and (corresponding with it is the division) of the Aristotelian philosophy. His work, however, (styled) Concerning the Soul, is obscure. For in the entire three books (where he treats of this subject) it is not possible to say clearly what is Aristotle's opinion concerning the soul. For, as regards the definition which he furnishes of soul, it is easy (enough) to declare this; but what it is that is signified by the definition is difficult to discover. For soul, he says, is an entelecheia of a natural organic body; (but to explain) what this is at all, would require a very great number of arguments and a lengthened investigation. As regards, however, the Deity, the Originator of all those glorious objects in creation, (the nature of) this (First Cause)--even to one conducting his speculations by a more prolonged inquiry than that concerning (the soul)--is more difficult to know than the soul itself. The definition, however, which Aristotle furnishes of the Deity is, I admit, not difficult to ascertain, but it is impossible to comprehend the meaning of it. For, he says, (the Deity) is a "conception of conception;" but this is altogether a non-existent (entity). The world, however, is incorruptible (and) eternal, according to Aristotle. For it has in itself nothing faulty, inasmuch as it is directed by Providence and Nature. And Aristotle has laid down doctrines not only concerning Nature and a cosmical system, and Providence, and God, but he has written (more than this); for there is extant by him likewise a certain treatise on ethical subjects, and these he inscribes Books of Ethics. But throughout these he aims at rendering the habits of his hearers excellent from being worthless. When, therefore, Basilides has been discovered, not in spirit alone, but also in the actual expressions and names, transferring the tenets of Aristotle into our evangelical and saving doctrine, what remains, but that, by restoring what he has appropriated from others, we should prove to the disciples of this (heretic) that Christ will in no wise profit them, inasmuch as they are heathenish?