Arnobius

“ Finally, that we may always abide by the rule and definition by which it has been shown and determined that whatever is done by man must have its causes, we will hold it fast here also, so as to demand of you what is the cause, what the reason, that incense is put on the altars before the very images of the deities, and that, from its being burned, they are supposed to become friendly and gentle. ”

“ For as you should show why you give incense to the gods, so, too, it follows that you should manifest that the gods have some reason for not rejecting it with disdain, nay more, for desiring it so fondly. ”