1 That system, then, which has respect to their Pleroma, and especially that part of it which refers to the primary Ogdoad being thus burdened with so great contradictions and perplexities, let me now go on to examine the remainder of their scheme. [In doing so] on account of their madness, I shall be making inquiry respecting things which have no real existence; yet it is necessary to do this, since the treatment of this subject has been entrusted to me, and since I desire all men to come to the knowledge of the truth, as well as because you yourself have asked to receive from me full and complete means for overturning [the views of] these men.
Source: Adversus haereses (New Advent)