Chapter XV.
How a thing that is good in its own nature ought not to be done for the sake of some lesser good.
For we ought not to practise pity, patience and love, and the precepts of the virtues mentioned above, wherein there is what is good in its own nature, for the sake of fasting, but rather fasting for the sake of them. For our endeavour must be that those virtues which are really good may be gained by fasting, not that the practice of those virtues may lead to fasting as its end. For this then the affliction of the flesh is useful, for this the remedy of abstinence must be employed; viz., that by it we may succeed in attaining to love, wherein there is what is good without change, and continually with no exception of time. For medicines, and the goldsmith's art, and the systems of other arts which there are in this world are not employed for the sake of the instruments which belong to the particular work; but rather the implements are prepared for the practice of the art. And as they are useful for those who understand them, so they are useless to those who are ignorant of the system of the art in question; and as they are a great help to those who rely on their aid for doing their work, so they cannot be of the smallest use to those who do not know for what purpose they were made, and are contented simply with the possession of them; because they make all their value consist in the mere having of them, and not in the performance of work. That then is in its own nature the best thing, for the sake of which things indifferent are done, but the very chiefest good is done not for the sake of anything else but because of its own intrinsic goodness.
Chapter XVI.
How what is good in its own nature can be distinguished from other things that are good.
And this may be distinguished from those other things which we have termed indifferent, in these ways: if a thing is good in itself and not by reason of something else: if it is useful for its own sake, and not for the sake of something else: if it is unchangeably and at all times good, and always keeps its character and can never become anything different: if its removal or cessation cannot fail to produce the greatest harm: if that which is its opposite is in the same way evil in its own nature, and can never be turned into anything good. And these descriptions by which the nature of things that are good in themselves can be distinguished, cannot possibly be applied to fasting, for it is not good of itself, nor useful for its own sake because it is wisely used for the acquisition of purity of heart and body, that the pricks of the flesh being dulled the soul may be pacified and reconciled to its Creator, nor is it unchangeably and at all times good, because often we are not injured by its intermission, and indeed sometimes if it is unreasonably practised it becomes injurious. Nor is that which seems its opposite evil in its own nature, i.e., the partaking of food, which is naturally agreeable, which cannot be regarded as evil, unless intemperance and luxury or some other faults are the result; "For not that which entereth into the mouth, defileth a man, but that which cometh out of the mouth, that defileth a man." [2191] And so a man disparages what is good in its own nature, and does not treat it properly or without sin, if he does it not for its own sake but for the sake of something else, for everything else should be done for the sake of it, but it should be sought for its own sake alone.
[2191] S. Matt. xv. 11.
Chapter XVII.
Of the reason for fasting and its value.
So then let us constantly remember this description of the character of fasting, and always aim at it with all the powers of the soul, in such a way as to recognize that then only is it suitable for us if in it we preserve regard for time, its character and degree, and this not so as to set the end of our hope upon it, but so that by it we may succeed in attaining to purity of heart and Apostolical love. Therefore from this it is clear that fasting, for which not only are there special seasons appointed at which it should be practised or relaxed, but conditions and rules also laid down, is not good in its own nature, but something indifferent. But those things which are either enjoined as good by the authority of a precept, or are forbidden as bad, are never subject to any exceptions of time in such a way that sometimes we should do what is forbidden or omit what is commanded. For there is no limit set to justice, patience, soberness, modesty, love, nor on the other hand is a licence ever granted for injustice, impatience, wrath, immodesty, envy, and pride.