Plotinos: Complete Works, v. 3 In Chronological Order,...

6. But if, independently of the things themselves, there be an One in itself, and a Decad in itself; and if the intelligible entities be unities, pairs, or triads, independently of what they are by their being, what then is the nature of these Numbers? What is their constitution? It must be admitted that a certain Reason presides over the generation of these Numbers. It is therefore necessary clearly to understand that in general, if intelligible forms at all exist, it is not because the thinking principle first thought each of them, and thereby gave them hypostatic existence. Justice, for instance, was not born because the thinking principle thought what justice was; nor movement, because it thought what movement was. Thus thought had to be posterior to the thing thought, and the thought of justice to justice itself. On the other hand, thought is anterior to the thing that owes its existence to thought, since this thing exists only because it is thought. If then justice were identical with such a thought, it would be absurd that justice should be nothing else than its definition; for in this case, the thinking of justice or movement, would amount to a conception of these objects (by a definition). Now this would be tantamount to conceiving the definition of a thing that did not exist, which is impossible.