BOOK II. XVIII. 2-9
reading for thirty days one after the other, and be engaged in something else, you will know what happens. So also if you lie in bed for ten days, get up and try to take a rather long walk, and you will see how wobbly your legs are. In general, therefore, if you want to do something, make a habit of it; if you want not to do something, refrain from doing it, and accustom yourself to something else instead. 5The same principle holds true in the affairs of the mind also; when you are angry, you may be sure, not merely that this evil has befallen you, but also that you have strengthened the habit, and have, as it were, added fuel to the flame. When you have yielded to someone in carnal intercourse, do not count merely this one defeat, but count also the fact that you have fed your incontinence, you have given it additional strength. For it is inevitable that some habits and faculties should, in consequence of the corresponding actions, spring up, though they did not exist before, and that others which were already there should be intensified and made strong.
In this way, without doubt, the infirmities of our mind and character spring up, as the philosophers say. For when once you conceive a desire for money, if reason be applied to bring you to a realization of the evil, both the passion is stilled and our governing principle is restored to its original authority; but if you do not apply a remedy, your governing principle does not revert to its previous condition, but, on being aroused again by the corresponding external impression, it bursts into the flame of desire more quickly than it did before. And if this happens over and over again, the next stage
