45. There is also a species of narrative resembling description, in which not a past but an existing state of things is made known to those who are ignorant of it. To this species belongs all that has been written about the situation of places, and the nature of animals, trees, herbs, stones, and other bodies. And of this species I have treated above, and have shown that this kind of knowledge is serviceable in solving the difficulties of Scripture, not that these objects are to be used conformably to certain signs as nostrums or the instruments of superstition; for that kind of knowledge I have already set aside as distinct from the lawful and free kind now spoken of. For it is one thing to say: If you bruise down this herb and drink it, it will remove the pain from your stomach; and another to say: If you hang this herb round your neck, it will remove the pain from your stomach. In the former case the wholesome mixture is approved of, in the latter the superstitious charm is condemned; although indeed, where incantations and invocations and marks are not used, it is frequently doubtful whether the thing that is tied or fixed in any way to the body to cure it, acts by a natural virtue, in which case it may be freely used; or acts by a sort of charm, in which case it becomes the Christian to avoid it the more carefully, the more efficacious it may seem to be. But when the reason why a thing is of virtue does not appear, the intention with which it is used is of great importance, at least in healing or in tempering bodies, whether in medicine or in agriculture.