2. We, however, who see the reason [of the thing] more clearly, do not hold this opinion, taking into account those [sins] which manifestly originate as a necessary consequence of our bodily constitution.[620] Must we indeed suppose that the devil is the cause of our feeling hunger or thirst? Nobody, I think, will venture to maintain that. If, then, he is not the cause of our feeling hunger and thirst, wherein lies the difference when each individual has attained the age of puberty, and that period has called forth the incentives of the natural heat? It will undoubtedly follow, that as the devil is not the cause of our feeling hunger and thirst, so neither is he the cause of that appetency which naturally arises at the time of maturity, viz. the desire of sexual intercourse. Now it is certain that this cause is not always so set in motion by the devil that we should be obliged to suppose that bodies would not possess a desire for intercourse of that kind if the devil did not exist. Let us consider, in the next place, if, as we have already shown, food is desired by human beings, not from a suggestion of the devil, but by a kind of natural instinct, whether, if there were no devil, it were possible for human experience to exhibit such restraint in partaking of food as never to exceed the proper limits; _i.e._ that no one would either take otherwise than the case required, or more than reason would allow; and so it would result that men, observing due measure and moderation in the matter of eating, would never go wrong. I do not think, indeed, that so great moderation could be observed by men (even if there were no instigation by the devil inciting thereto), as that no individual, in partaking of food, would go beyond due limits and restraint, until he had learned to do so from long usage and experience. What, then, is the state of the case? In the matter of eating and drinking it was possible for us to go wrong, even without any incitement from the devil, if we should happen to be either less temperate or less careful [than we ought]; and are we to suppose, then, in our appetite for sexual intercourse, or in the restraint of our natural desires, our condition is not something similar?[621] I am of opinion, indeed, that the same course of reasoning must be understood to apply to other natural movements, as those of covetousness, or of anger, or of sorrow, or of all those generally which through the vice of intemperance exceed the natural bounds of moderation. There are therefore manifest reasons for holding the opinion, that as in good things the human will[622] is of itself weak to accomplish any good (for it is by divine help that it is brought to perfection in everything); so also, in things of an opposite nature we receive certain initial elements, and, as it were, seeds of sins, from those things which we use agreeably to nature;[623] but when we have indulged them beyond what is proper, and have not