If each pursues exclusively the happiness of others; and if each is also a recipient of happiness (which he must be, for otherwise no aggregate happiness can be formed out of their individual happinesses); then the implication is that each gains the happiness due to altruistic action exclusively; and that in each this is greater in amount than the egoistic happiness obtainable by him, if he devoted himself to pursuit of it. Leaving out of consideration for a moment these relative amounts of the two, let us note the conditions to the receipt of altruistic happiness by each. The sympathetic nature gets pleasure by giving pleasure; and the proposition is that if the general happiness is the object of pursuit, each will be made happy by witnessing others' happiness. But what in such case constitutes the happiness of others? These others are also, by the hypothesis, pursuers and receivers of altruistic pleasure. The genesis of altruistic pleasure in each is to depend on the display of pleasures by others; which is again to depend on the display of pleasures by others; and so on perpetually. Where, then, is the pleasure to begin? Obviously there must be egoistic pleasure somewhere before there can be the altruistic pleasure caused by sympathy with it. Obviously, therefore, each must be egoistic in due amount, even if only with the view of giving others the possibility of being altruistic. So far from the sum of happiness being made greater if all make greatest happiness the exclusive end, the sum disappears entirely. How absurd is the supposition that the happiness of all can be achieved without each pursuing his own happiness, will be best shown by a physical simile. Suppose a cluster of bodies, each of which generates heat, and each of which is, therefore, while a radiator of heat to those around, also a receiver of heat from them. Manifestly each will have a certain proper heat irrespective of that which it gains from the rest; and, each will have a certain heat gained from the rest irrespective of its proper heat. What will happen? So long as each of the bodies continues to be a generator of heat, each continues to maintain a temperature partly derived from itself and partly derived from others. But if each ceases to generate heat for itself and depends on the heat radiated to it by the rest, the entire cluster becomes cold. Well, the self-generated heat stands for egoistic pleasure; the heat radiated and received stands for sympathetic pleasure; and the disappearance of all heat if each ceases to be an originator of it, corresponds to the disappearance of all pleasure if each ceases to originate it egoistically.