In the second place, when, as the hypothesis implies, altruistic pleasures have reached a greater intensity than they now possess, each person will be debarred from undue pursuit of them by the consciousness that other persons, too, desire them, and that scope for others' enjoyment of them must be left. Even now may be observed among groups of friends, where some competition in amiability is going on, relinquishments of opportunities for self-abnegation that others may have them. "Let her give up the gratification, she will like to do so;" "Let him undertake the trouble, it will please him;" are suggestions which, from time to time, illustrate this consciousness. The most developed sympathy will care for the sympathetic satisfactions of others as well as for their selfish satisfactions. What may be called a higher equity will refrain from trespassing on the spheres of others' altruistic activities, as a lower equity refrains from trespassing on the spheres of their egoistic activities. And by this checking of what may be called an egoistic altruism, undue sacrifices on the part of each must be prevented. What spheres, then, will eventually remain for altruism as it is commonly conceived? There are three. One of them must to the last continue large in extent; and the others must progressively diminish, though they do not disappear. The first is that which family life affords. Always there must be a need for subordination of self-regarding feelings to other-regarding feelings in the rearing of children. Though this will diminish with diminution in the number to be reared, yet it will increase with the greater elaboration, and prolongation of the activities on their behalf. But as shown above, there is even now partially effected a conciliation such that those egoistic satisfactions which parenthood yields are achieved through altruistic activities--a conciliation tending ever toward completeness. An important development of family altruism must be added: the reciprocal care of parents by children during old age--a care becoming lighter and better fulfilled, in which a kindred conciliation may be looked for. Pursuit of social welfare at large must afford hereafter, as it does now, scope for the postponement of selfish interests to unselfish interests, but a continually lessening scope; because as adaptation to the social state progresses the needs for those regulative actions by which social life is made harmonious become less. And here the amount of altruistic action which each undertakes must inevitably be kept within moderate bounds by others; for if they are similarly altruistic, they will not allow some to pursue public ends to their own considerable detriment that the rest may profit.