6 Let them not then declare that the first and principal Ogdoad consists of Logos and Sige, but let them [as a matter of necessity] exclude either Sige or Logos; and then their first and principal Ogdoad is at an end. For if they describe the conjunctions [of the Æons] as united, then their whole argument fails to pieces. Since, if they were united, how could Sophia have generated a defect without union with her consort? If, on the other hand, they maintain that, as in production, each of the Æons possesses his own peculiar substance, then how can Sige and Logos manifest themselves in the same place? So far, then, with respect to defect.
Source: Adversus haereses (New Advent)