5 For if He produced intelligence, then He who did thus produce intelligence must be understood, in accordance with their views, as a compound and corporeal Being; so that God, who sent forth [the intelligence referred to], is separate from it, and the intelligence which was sent forth separate [from Him]. But if they affirm that intelligence was sent forth from intelligence, they then cut asunder the intelligence of God, and divide it into parts. And whither has it gone?
Whence was it sent forth? For whatever is sent forth from any place, passes of necessity into some other. But what existence was there more ancient than the intelligence of God, into which they maintain it was sent forth? And what a vast region that must have been which was capable of receiving and containing the intelligence of God! If, however, they affirm [that this emission took place] just as a ray proceeds from the sun, then, as the subjacent air which receives the ray must have had an existence prior to it, so [by such reasoning] they will indicate that there was something in existence, into which the intelligence of God was sent forth, capable of containing it, and more ancient than itself.
Following upon this, we must hold that, as we see the sun, which is less than all things, sending forth rays from himself to a great distance, so likewise we say that the Propator sent forth a ray beyond, and to a great distance from, Himself. But what can be conceived of beyond, or at a distance from, God, into which He sent forth this ray?
Source: Adversus haereses (New Advent)