This whole theory presupposes that pleasure is the standard of value for life. Now life manifests itself through a number of instincts (needs). If the value of life depended on its producing more pleasure than pain, an instinct would have to be called valueless which brought to its owner a balance of pain. Let us, if you please, inspect instinct and pleasure, in order to see whether the former can be measured by the latter. And lest we give rise to the suspicion that life does not begin for us below the sphere of the "aristocrats of the intellect," we shall begin our examination with a "purely animal" need, viz., hunger. Hunger arises when our organs are unable to continue functioning without a fresh supply of food. What a hungry man desires, in the first instance, is to have his hunger stilled. As soon as the supply of nourishment has reached the point where hunger ceases, everything has been attained that the food-instinct craves. The pleasure which is connected with satiety consists, to begin with, in the removal of the pain which is caused by hunger. But to the mere food-instinct there is added a further need. For man does not merely desire to restore, by the consumption of food, the disturbance in the functioning of his organs, or to get rid of the pain of hunger, but he seeks to effect this to the accompaniment of pleasurable sensations of taste. When he feels hungry, and is within half an hour of a meal to which he looks forward with pleasure, he avoids spoiling his enjoyment of the better food by taking inferior food which might satisfy his hunger sooner. He needs hunger in order to get the full enjoyment out of his meal. Thus hunger becomes for him at the same time a cause of pleasure. Supposing all the hunger in the world could be satisfied, we should get the total quantity of pleasure which we owe to the existence of the desire for nourishment. But we should still have to add the additional pleasure which gourmets gain by cultivating the sensibility of their taste-nerves beyond the common measure. The greatest conceivable value of this quantity of pleasure would be reached, if no need remained unsatisfied which was in any way connected with this kind of pleasure, and if with the smooth of pleasure we had not at the same time to take a certain amount of the rough of pain.