And concerning this too there is much discourse, whence Simon and Valentinus will also be found to have taken their starting-points from here as well; and if they should not admit this, they are, first, liars, and then, heretics. Since, then, it seems that we have set forth these matters sufficiently, and all the doctrines that seem to belong to earthly philosophy have been comprehended in four books, it seems [right] to proceed to the disciples of these men — or rather, to the pilferers of their words.