9 I am not aware that, besides these productions [which have been mentioned], they are able to speak of any other; indeed, they have not been known to me (although I have had very frequent discussions with them concerning forms of this kind) as ever setting forth any other peculiar kind of being as produced [in the manner under consideration]. This only they maintain, that each one of these was so produced as to know merely that one who produced him, while he was ignorant of the one who immediately preceded.
But they do not in this matter go forward [in their account] with any kind of demonstration as to the manner in which these were produced, or how such a thing could take place among spiritual beings. For, in whatsoever way they may choose to go forward, they will feel themselves bound (while, as regards the truth, they depart entirely from right reason) to proceed so far as to maintain that their Word, who springs from the Nous of the Propator, — to maintain, I say, that he was produced in a state of degeneracy.
For [they hold] that perfect Nous, previously begotten by the perfect Bythus, was not capable of rendering that production which issued from him perfect, but [could only bring it forth] utterly blind to the knowledge and greatness of the Father. They also maintain that the Saviour exhibited an emblem of this mystery in the case of that man who was blind from his birth, since the Æon was in this manner produced by Monogenes blind, that is, in ignorance, thus falsely ascribing ignorance and blindness to the Word of God, who, according to their own theory, holds the second [place of] production from the Propator.
Admirable sophists, and explorers of the sublimities of the unknown Father, and rehearsers of those super-celestial mysteries “which the angels desire to look into!” — that they may learn that from the Nous of that Father who is above all, the Word was produced blind, that is, ignorant of the Father who produced him!
Source: Adversus haereses (New Advent)