These doctrines, then, the Naasseni attempt to establish, calling themselves Gnostics. But since the error is many-headed and diversified, resembling, in truth, the hydra that we read of in history; when, at one blow, we have struck off the heads of this (delusion) by means of refutation, employing the wand of truth, we shall entirely exterminate the monster. For neither do the remaining heresies present much difference of aspect from this, having a mutual connection through (the same) spirit of error. But since, altering the words and the names of the serpent, they wish that there should be many heads of the serpent, neither thus shall we fail thoroughly to refute them as they desire.
Reproduced in full. Translation: Ante-Nicene Fathers, vol. 5 (Roberts and Donaldson, 1886), public domain (Public domain).