“[W]hen they write incantations, and utter them as to the stars, not only to [the bodies and] souls of these, but also to things superior to soul, what do they effect? They answer, charms, allurements, and persuasions, so that the stars hear the words addressed to them, and are drawn down; if any one of us knows how in a more artificial manner to utter these incantations, sounds, aspirations of the voice, and hissings, and such other particulars as in their writings are said to possess a magical power. …They likewise pretend that they can expel disease. And if, indeed, they say that they effect this by temperance and an orderly mode of life, they speak rightly, and conformably to philosophers. But now when they assert that diseases are daemons, and that they are able to expel these by words, and proclaim that they possess this ability, they may appear to the multitude to be more venerable, who admire the powers of magicians; but they will not persuade intelligent men that diseases have not their causes either from labours, or satiety, or indigence, or putrefaction, and in short from mutations which either have an external or internal origin. This, however, is manifest from the cure of diseases. For disease is deduced downward, so as to pass away externally, either through a flux of the belly, or the operation of medicine. Disease, also, is cured by letting of blood and fasting. …The disease …[is] something different from the daemon. …The manner, however, in which these things are asserted by the Gnostics, and on what account is evident; since for the sake of this, no less than of other things, we have mentioned these daemons. …And this must every where be considered, that he who pursues our form of philosophy, will, besides all other goods, genuinely exhibit simple and venerable manners, in conjunction with the possession of wisdom, and will not endeavour to become insolent and proud; but will possess confidence accompanied with reason, much security and caution, and great circumspection.”

Against the Gnostics