Now opportunities for practicing altruism are numerous and great in proportion as there is weakness, or incapacity, or imperfection. If we passed beyond the limits of the family, in which a sphere for self-sacrificing activities must be preserved as long as offspring have to be reared; and if we ask how there can continue a social sphere for self-sacrificing activities, it becomes obvious that the continued existence of serious evils, caused by prevalent defects of nature, is implied. As fast as men adapt themselves to the requirements of social life, so fast will the demands for efforts on their behalf diminish. And with arrival at finished adaptation, when all persons are at once completely self-conserved and completely able to fulfill the obligations which society imposes on them, those occasions for postponement of self to others, which pure altruism contemplates, disappear. Such self-sacrifices become, indeed, doubly impracticable. Carrying on successfully their several lives, men not only cannot yield to those around the opportunities for giving aid, but aid cannot ordinarily be given them without interfering with their normal activities, and so diminishing their pleasures. Like every inferior creature, led by its innate desires spontaneously to do all that its life requires, man, when completely molded to the social state, must have desires so adjusted to his needs that he fulfills the needs in gratifying the desires. And if his desires are severally gratified by the performance of required acts, none of these can be performed for him without balking his desires. Acceptance from others of the results of their activities can take place only on condition of relinquishing the pleasures derived from his own activities. Diminution rather than increase of happiness would result, could altruistic action in such case be enforced. And here, indeed, we are introduced to another baseless assumption which the theory makes. § 88. The postulate of utilitarianism as formulated in the statements above quoted, and of pure altruism as otherwise expressed, involves the belief that it is possible for happiness, or the means to happiness, or the conditions to happiness, to be transferred. Without any specified limitation the proposition taken for granted is, that happiness in general admits of detachment from one and attachment to another--that surrender to any extent is possible by one and appropriation to any extent is possible by another. But a moment's thought shows this to be far from the truth. On the one hand, surrender carried to a certain point is extremely mischievous and to a further point fatal; and on the other hand, much of the happiness each enjoys is self-generated and can neither be given nor received.