3 And that they are the truly “spiritual,” inasmuch as a certain particle of the Father of the universe has been deposited in their souls, since, according to their assertions, they have souls formed of the same substance as the Demiurge himself, yet that he, although he received from the Mother, once for all, the whole [of the divine] seed, and possessed it in himself, still remained of an animal nature, and had not the slightest understanding of those things which are above, which things they boast that they themselves understand, while they are still on earth—does not this crown all possible absurdity? For to imagine that the very same seed conveyed knowledge and perfection to the souls of these men, while it only gave rise to ignorance in the God who made them, is an opinion that can be held only by those utterly frantic, and totally destitute of common sense.
Source: Adversus haereses (New Advent)