1 But what sort of talk also is this concerning their seed— that it was conceived by the mother according to the configuration of those angels who wait upon the Saviour—shapeless, without form, and imperfect; and that it was deposited in the Demiurge without his knowledge, in order that through his instrumentality it might attain to perfection and form in that soul which he had, [so to speak,] filled with seed? This is to affirm, in the first place, that those angels who wait upon their Saviour are imperfect, and without figure or form; if indeed that which was conceived according to their appearance was generated any such kind of being [as has been described].
Source: Adversus haereses (New Advent)