This compromise, vague, ambiguous, illogical, though it may be, is nevertheless for the time being authoritative. For if, as above shown, the welfare of the society must take precedence of the welfares of its component individuals, during those stages in which the individuals have to preserve themselves by preserving their society, then such temporary compromise between the two codes of conduct as duly regards external defense, while favoring internal co-operation to the greatest extent practicable, subserves the maintenance of life in the highest degree; and thus gains the ultimate sanction. So that the perplexed and inconsistent moralities of which each society and each age shows us a more or less different one, are severally justified as being approximately the best under the circumstances.

But such moralities are, by their definitions, shown to belong to incomplete conduct; not to conduct that is fully evolved. We saw that the adjustments of acts to ends which, while constituting the external manifestations of life, conduce to the continuance of life, have been rising to a certain ideal form now approached by the civilized man. But this form is not reached so long as there continue aggressions of one society upon another. Whether the hinderances to complete living result from the trespasses of fellow-citizens, or from the trespasses of aliens, matters not; if they occur there does not yet exist the state defined. The limit to the evolution of conduct is arrived at by members of each society only when, being arrived at by members of other societies also, the causes of international antagonism end simultaneously with the causes of antagonism between individuals.

And now having from the sociological point of view recognized the need for, and authority of, these changing systems of ethics, proper to changing ratios between warlike activities and peaceful activities, we have, from the same point of view, to consider the system of ethics proper to the state in which peaceful activities are undisturbed.

§ 51. If, excluding all thought of danger or hinderances from causes external to a society, we set ourselves to specify those conditions under which the life of each person, and therefore of the aggregate, may be the greatest possible, we come upon certain simple ones which, as here stated, assume the form of truisms.

For, as we have seen, the definition of that highest life accompanying completely evolved conduct, itself excludes all acts of aggression—not only murder, assault, robbery, and the major offences generally, but minor offences, such as libel, injury to property and so forth. While directly deducting from individual life, these indirectly cause perturbations of social life. Trespasses against others rouse antagonisms in them; and if these are numerous the group loses coherence. Hence, whether the integrity of the group itself is considered as the end, or whether the end considered is the benefit ultimately secured to its units by maintaining its integrity, or whether the immediate benefit of its units taken separately is considered the end, the implication is the same: such acts are at variance with achievement of the end. That these inferences are self-evident and trite (as indeed the first inferences drawn from the data of every science that reaches the deductive stage naturally are) must not make us pass lightly over the all-important fact that, from the sociological point of view, the leading moral laws are seen to follow as corollaries from the definition of complete life carried on under social conditions.

Respect for these primary moral laws is not enough, however. Associated men pursuing their several lives without injuring one another but without helping one another, reap no advantages from association beyond those of companionship. If, while there is no co-operation for defensive purposes (which is here excluded by the hypothesis) there is also no co-operation for satisfying wants, the social state loses its raison d'être—almost, if not entirely. There are, indeed, people who live in a condition little removed from this: as the Esquimaux. But though these, exhibiting none of the co-operation necessitated by war, which is unknown to them, lead lives such that each family is substantially independent of others, occasional co-operation occurs. And, indeed, that families should live in company without ever yielding mutual aid, is scarcely conceivable.

Nevertheless, whether actually existing or only approached, we must here recognize as hypothetically possible a state in which these primary moral laws are conformed to; for the purpose of observing, in their uncomplicated forms, what are the negative conditions to harmonious social life. Whether the members of a social group do or do not co-operate, certain limitations to their individual activities are necessitated by their association; and, after recognizing these as arising in the absence of co-operation, we shall be the better prepared to understand how conformity to them is effected when co-operation begins.

§ 52. For whether men live together in quite independent ways, careful only to avoid aggressing; or whether, advancing from passive association to active association, they co-operate, their conduct must be such that the achievement of ends by each shall at least not be hindered. And it becomes obvious that when they co-operate there must not only be no resulting hinderance but there must be facilitation; since, in the absence of facilitation, there can be no motive to co-operate. What shape, then, must the mutual restraints take when co-operation begins? or rather—What, in addition to the primary mutual restraints already specified, are those secondary mutual restraints required to make co-operation possible?

One who, living in an isolated way, expends effort in pursuit of an end, gets compensation for the effort by securing the end, and so achieves satisfaction. If he expends the effort without achieving the end there results dissatisfaction. The satisfaction and the dissatisfaction are measures of success and failure in life-sustaining acts; since that which is achieved by effort is something which directly or indirectly furthers life, and so pays for the cost of the effort; while if the effort fails there is nothing to pay for the cost of it, and so much life is wasted. What must result from this when men's efforts are joined? The reply will be made clearer if we take the successive forms of co-operation in the order of ascending complexity. We may distinguish as homogeneous co-operation (1) that in which like efforts are joined for like ends that are simultaneously enjoyed. As co-operation that is not completely homogeneous we may distinguish (2) that in which like efforts are joined for like ends that are not simultaneously enjoyed. A co-operation of which the heterogeneity is more distinct is (3) that in which unlike efforts are joined for like ends. And lastly comes the decidedly heterogeneous co-operation (4) that in which unlike efforts are joined for unlike ends.

The simplest and earliest of these in which men's powers, similar in kind and degree, are united in pursuit of a benefit which, when obtained, they all participate in, is most familiarly exemplified in the catching of game by primitive men: this simplest and earliest form of industrial co-operation being also that which is least differentiated from militant co-operation; for the co-operators are the same, and the processes, both destructive of life, are carried on in analogous ways. The condition under which such co-operation may be successfully carried on is that the co-operators shall share alike in the produce. Each thus being enabled to repay himself in food for the expended effort, and being further enabled to achieve other such desired ends as maintenance of family, obtains satisfaction: there is no aggression of one on another, and the co-operation is harmonious. Of course the divided produce can be but roughly proportioned to the several efforts joined in obtaining it, but there is actually among savages, as we see that for harmonious co-operation there must be, a recognition of the principle that efforts when combined shall severally bring equivalent benefits, as they would do if they were separate. Moreover, beyond the taking equal shares in return for labors that are approximately equal, there is generally an attempt at proportioning benefit to achievement, by assigning something extra, in the shape of the best part or the trophy, to the actual slayer of the game. And obviously, if there is a wide departure from this system of sharing benefits when there has been a sharing of efforts, the co-operation will cease. Individual hunters will prefer to do the best they can for themselves separately.