text: "But," someone will say, "we know what is cold and what is hot; a lukewarm temperature lies between. Similarly, A is happy, and B is wretched, and C is neither happy nor wretched." I wish to examine this figure, which is brought into play against us. If I add to your lukewarm water a larger quantity of cold water, the result will be cold water. But if I pour in a larger quantity of hot water, the water will finally become hot. In the case, however, of your man who is neither wretched nor happy, no matter how much I add to his troubles, he will not be unhappy, according to your argument; hence your figure offers no analogy. Again, suppose that I set before you a man who is neither miserable nor happy. I add blindness to his misfortunes; he is not rendered unhappy. I cripple him; he is not rendered unhappy. I add afflictions which are unceasing and severe; he is not rendered unhappy. Therefore, one whose life is not changed to misery by all these ills is not dragged by them, either, from his life of happiness. Then if, as you say, the wise man cannot fall from happiness to wretchedness, he cannot fall into non-happiness. For how, if one has begun to slip, can one stop at any particular place? That which prevents him from rolling to the bottom, keeps him at the summit. Why, you urge, may not a happy life possibly be destroyed? It cannot even be disjointed; and for that reason virtue is itself of itself sufficient for the happy life.