In the private relations of men, opportunities for self-sacrifice prompted by sympathy, must ever in some degree, though eventually in a small degree, be afforded by accidents, diseases, and misfortunes in general; since, however near to completeness the adaptation of human nature to the conditions of existence at large, physical and social, may become, it can never reach completeness. Flood, fire, and wreck must to the last yield at intervals opportunities for heroic acts; and in the motives to such acts, anxiety for others will be less alloyed with love of admiration than now. Extreme, however, as may be the eagerness for altruistic action on the rare occasions hence arising, the amount falling to the share of each must, for the reasons given, be narrowly limited. But though in the incidents of ordinary life, postponements of self to others in large ways must become very infrequent, daily intercourse will still furnish multitudinous small occasions for the activity of fellow feeling. Always each may continue to further the welfare of others by warding off from them evils they cannot see, and by aiding their actions in ways unknown to them; or, conversely putting it, each may have, as it were, supplementary eyes and ears in other persons, which perceive for him things he cannot perceive himself: so perfecting his life in numerous details, by making its adjustment to environing actions complete. § 97. Must it then follow that eventually, with this diminution of the spheres for it, altruism must diminish in total amount? By no means. Such a conclusion implies a misconception. Naturally, under existing conditions, with suffering widely diffused and so much of effort demanded from the more fortunate in succoring the less fortunate, altruism is understood to mean only self-sacrifice; or, at any rate, a mode of action which, while it brings some pleasure, has an accompaniment of self-surrender that is not pleasurable. But the sympathy which prompts denial of self to please others is a sympathy which also receives pleasure from their pleasures when they are otherwise originated. The stronger the fellow-feeling which excites efforts to make others happy, the stronger is the fellow-feeling with their happiness however caused.