Through sympathy both these forms of feeling are excited. Now a pleasurable consciousness is aroused on witnessing pleasure; now a painful consciousness is aroused on witnessing pain. Hence, if beings around him habitually manifest pleasure and but rarely pain, sympathy yields to its possessor a surplus of pleasure; while, contrariwise, if little pleasure is ordinarily witnessed and much pain, sympathy yields a surplus of pain to its possessor. The average development of sympathy must, therefore, be regulated by the average manifestations of pleasure and pain in others. If the life usually led under given social conditions is such that suffering is daily inflicted, or is daily displayed by associates, sympathy cannot grow: to assume growth of it is to assume that the constitution will modify itself in such way as to increase its pains and therefore depress its energies; and is to ignore the truth that bearing any kind of pain gradually produces insensibilty to that pain, or callousness. On the other hand, if the social state is such that manifestations of pleasure predominate, sympathy will increase; since sympathetic pleasures, adding to the totality of pleasures enhancing vitality, conduce to the physical prosperity of the most sympathetic, and since the pleasures of sympathy exceeding its pains in all, lead to an exercise of it which strengthens it. The first implication is one already more than once indicated. We have seen that along with habitual militancy and under the adapted type of social organization, sympathy cannot develop to any considerable height. The destructive activities carried on against external enemies sear it; the state of feeling maintained causes within the society itself frequent acts of aggression or cruelty; and further, the compulsory co-operation characterizing the militant _régime_ necessarily represses sympathy--exists only on condition of an unsympathetic treatment of some by others.