7 If, again, they declare that their Æons were sent forth just as rays are from the sun, then, since all are of the same substance and sprung from the same source, all must either be capable of passion along with Him who produced them, or all will remain impassible for ever. For they can no longer maintain that, of beings so produced, some are impassible and others passible. If, then, they declare all impassible, they do themselves destroy their own argument. For how could the youngest Æon have suffered passion if all were impassible?
If, on the other hand, they declare that all partook of this passion, as indeed some of them venture to maintain, then, inasmuch as it originated with Logos, but flowed onwards to Sophia, they will thus be convicted of tracing back the passion to Logos, who is the Nous of this Propator, and so acknowledging the Nous of the Propator and the Father Himself to have experienced passion. For the Father of all is not to be regarded as a kind of compound Being, who can be separated from his Nous (mind), as I have already shown; but Nous is the Father, and the Father Nous.
It necessarily follows, therefore, both that he who springs from Him as Logos, or rather that Nous himself, since he is Logos, must be perfect and impassible, and that those productions which proceed from him, seeing that they are of the same substance with himself, should be perfect and impassible, and should ever remain similar to him who produced them.
Source: Adversus haereses (New Advent)