Our desire, in any given case, is directed to a particular object. The value of the pleasure of satisfaction, as we have seen, will be the greater in proportion as the quantity of the pleasure is greater relatively to the intensity of our desire. [13] It depends, further, on this intensity how large a quantity of pain we are willing to bear in order to gain the pleasure. We compare the quantity of pain, not with the quantity of pleasure, but with the intensity of our desire. He who finds great pleasure in eating will, by reason of his pleasure in better times, be more easily able to bear a period of hunger than one who does not derive pleasure from the satisfaction of the instinct for food. A woman who wants a child compares the pleasures resulting from the possession of a child, not with the quantities of pain due to pregnancy, birth, nursing, etc., but with her desire for the possession of the child. We never aim at a certain quantity of pleasure in the abstract, but at concrete satisfaction of a perfectly determinate kind. When we are aiming at a definite object or a definite sensation, it will not satisfy us to be offered some other object or some other sensation, even though they give the same amount of pleasure. If we desire satisfaction of hunger, we cannot substitute for the pleasure which this satisfaction would bring a pleasure equally great but produced by a walk. Only if our desire were, quite generally, for a certain quantity of pleasure, would it have to die away at once if this pleasure were unattainable except at the price of an even greater quantity of pain. But because we desire a determinate kind of satisfaction, we experience the pleasure of realisation even when, along with it, we have to bear an even greater pain. The instincts of living beings tend in a determinate direction and aim at concrete objects, and it is just for this reason that it is impossible, in our calculations, to set down as an equivalent factor the quantities of pain which we have to bear in the pursuit of our object. Provided the desire is sufficiently intense to be still to some degree in existence even after having overcome the pain--however great that pain, taken in the abstract, may be--the pleasure of satisfaction may still be enjoyed to its full extent. The desire, therefore, does not measure the pain directly against the pleasure which we attain, but indirectly by measuring the pain (proportionately) against its own intensity. The question is not whether the pleasure to be gained is greater than the pain, but whether the desire for the object at which we aim is greater than the inhibitory effect of the pain which we have to face. If the inhibition is greater than the desire, the latter yields to the inevitable, slackens, and ceases to strive. But inasmuch as we strive after a determinate kind of satisfaction, the pleasure we gain thereby acquires an importance which makes it possible, once satisfaction has