The Reason for Fasting and Its Worth

So let us always remember this description of the character of fasting, and always strive toward it with all the powers of the soul, in such a way as to recognize that it is fitting for us only if in it we keep due regard for the time, its manner and its measure; and this not so as to set the goal of our hope on it, but so that by it we may succeed in reaching purity of heart and apostolic love. From this, then, it is clear that fasting is not good in its own nature but something indifferent, since not only are special seasons appointed for keeping or relaxing it, but conditions and rules are laid down for it as well. But things that are either required as good by the authority of a command, or forbidden as bad, are never subject to any exceptions of time, so that sometimes we should do what is forbidden or leave undone what is commanded. For no limit is set to justice, patience, sobriety, modesty and love; nor, on the other hand, is permission ever granted for injustice, impatience, anger, immodesty, envy and pride.