Now always and everywhere, there arises among men a theory conforming to their practice. The savage nature, originating the conception of a savage deity, evolves a theory of supernatural control sufficiently stringent and cruel to influence his conduct. With submission to despotic government severe enough in its restraints to keep in order barbarous natures, there grows up a theory of divine right to rule, and the duty of absolute submission. Where war is made the business of life by the existence of warlike neighbors, virtues which are required for war come to be regarded as supreme virtues; while, contrariwise, when industrialism has grown predominant, the violence and the deception which warriors glory in come to be held criminal. In like manner, then, there arises a tolerable adjustment of the actually accepted (not the nominally accepted) theory of right living, to living as it is daily carried on. If the life is one that necessitates habitual denial of pleasures and bearing of pains, there grows up an answering ethical system under which the receipt of pleasures is tacitly disapproved and the bearing of pains avowedly approved. The mischiefs entailed by pleasures in excess are dwelt on, while the benefits which normal pleasures bring are ignored; and the good results achieved by submission to pains are fully set forth, while the evils are overlooked.

But while recognizing the desirableness of, and indeed the necessity for, systems of ethics adapted, like religious systems and political systems, to their respective times and places, we have here to regard the first as, like the others, transitional. We must infer that like a purer creed and a better government, a truer ethics belongs to a more advanced social state.

Led, à priori, to conclude that distortions must exist, we are enabled to recognize as such the distortions we find: answering in nature, as these do, to expectation. And there is forced on us the truth that a scientific morality arises only as fast as the one-sided conceptions adapted to transitory conditions are developed into both-sided conceptions. The science of right living has to take account of all consequences in so far as they affect happiness, personally or socially, directly or indirectly; and by as much as it ignores any class of consequences, by so much does it fail to be science.

§ 39. Like the physical view, then, the biological view corresponds with the view gained by looking at conduct in general from the standpoint of Evolution.

That which was physically defined as a moving equilibrium, we define biologically as a balance of functions. The implication of such a balance is that the several functions, in their kinds, amounts, and combinations, are adjusted to the several activities which maintain and constitute complete life; and to be so adjusted is to have reached the goal toward which the evolution of conduct continually tends.

Passing to the feelings which accompany the performance of functions, we see that of necessity during the evolution of organic life, pleasures have become the concomitants of normal amounts of functions, while pains, positive and negative, have become the concomitants of excesses and defects of functions. And though in every species derangements of these relations are often caused by changes of conditions, they ever re-establish themselves: disappearance of the species being the alternative.

Mankind, inheriting from creatures of lower kinds, such adjustments between feelings and functions as concern fundamental bodily requirements; and daily forced by peremptory feelings to do the things which maintain life and avoid those which bring immediate death; has been subject to a change of conditions unusually great and involved. This has considerably deranged the guidance by sensations, and has deranged in a much greater degree the guidance by emotions. The result is that in many cases pleasures are not connected with actions which must be performed, nor pains with actions which must be avoided, but contrariwise.

Several influences have conspired to make men ignore the well-working of these relations between feelings and functions, and to observe whatever of ill-working is seen in them. Hence, while the evils which some pleasures entail are dilated upon, the benefits habitually accompanying receipt of pleasures are unnoticed; at the same time that the benefits achieved through certain pains are magnified while the immense mischiefs which pains bring are made little of.

The ethical theories characterized by these perversions are products of, and are appropriate to the forms of social life which the imperfectly-adapted constitutions of men produce. But with the progress of adaptation, bringing faculties and requirements into harmony, such incongruities of experience, and consequent distortions of theory, must diminish; until, along with complete adjustment of humanity to the social state, will go recognition of the truths that actions are completely right only when, besides being conducive to future happiness, special and general, they are immediately pleasurable, and that painfulness, not only ultimate but proximate, is the concomitant of actions which are wrong.

So that from the biological point of view, ethical science becomes a specification of the conduct of associated men who are severally so constituted that the various self-preserving activities, the activities required for rearing offspring, and those which social welfare demands, are fulfilled in the spontaneous exercise of duly proportioned faculties, each yielding when in action its quantum of pleasure, and who are, by consequence, so constituted that excess or defect in any one of these actions brings its quantum of pain, immediate and remote.