After this explanation will be apprehended a truth otherwise set forth in the Principles of Psychology. Mind consists of feelings and the relations among feelings. By composition of the relations, and ideas of relations, intelligence arises. By composition of the feelings, and ideas of feelings, emotion arises. And, other things equal, the evolution of either is great in proportion as the composition is great. One of the necessary implications is that cognition becomes higher in proportion as it is remoter from reflex action; while emotion becomes higher in proportion as it is remoter from sensation.

And now of the various corollaries from this broad view of psychological evolution, let us observe those which concern the motives and actions that are classed as moral and immoral.

§ 42. The mental process by which, in any case, the adjustment of acts to ends is effected, and which, under its higher forms, becomes the subject-matter of ethical judgments, is, as above implied, divisible into the rise of a feeling or feelings constituting the motive, and the thought or thoughts through which the motive is shaped and finally issues in action. The first of these elements, originally an excitement, becomes a simple sensation; then a compound sensation; then a cluster of partially presentative and partially representative sensations, forming an incipient emotion; then a cluster of exclusively ideal or representative sensations, forming an emotion proper; then a cluster of such clusters, forming a compound emotion; and eventually becomes a still more involved emotion composed of the ideal forms of such compound emotions. The other element, beginning with that immediate passage of a single stimulus into a single motion, called reflex action, presently comes to be a set of associated discharges of stimuli producing associated motions, constituting instinct. Step by step arise more entangled combinations of stimuli, somewhat variable in their modes of union, leading to complex motions similarly variable in their adjustments; whence occasional hesitations in the sensori-motor processes. Presently is reached a stage at which the combined clusters of impressions, not all present together, issue in actions not all simultaneous; implying representation of results, or thought. Afterward follow stages in which various thoughts have time to pass before the composite motives produce the appropriate actions. Until at last arise those long deliberations during which the probabilities of various consequences are estimated, and the promptings of the correlative feelings balanced, constituting calm judgment. That under either of its aspects the later forms of this mental process are the higher, ethically considered as well as otherwise considered, will be readily seen.

For from the first, complication of sentiency has accompanied better and more numerous adjustments of acts to ends; as also has complication of movement, and complication of the co-ordinating or intellectual process uniting the two. Whence it follows that the acts characterized by the more complex motives and the more involved thoughts, have all along been of higher authority for guidance. Some examples will make this clear.

Here is an aquatic creature guided by the odor of organic matter toward things serving for food; but a creature which, lacking any other guidance, is at the mercy of larger creatures coming near. Here is another which, also guided to food by odor, possesses rudimentary vision; and so is made to start spasmodically away from a moving body which diffuses this odor, in those cases where it is large enough to produce sudden obscuration of light—usually an enemy. Evidently life will frequently be saved by conforming to the later and higher stimulus, instead of to the earlier and lower.

Observe at a more advanced stage a parallel conflict. This is a beast which pursues others for prey, and, either lacking experience or prompted by raging hunger, attacks one more powerful than itself, and gets destroyed. Conversely, that is a beast which, prompted by a hunger equally keen, but either by individual experience or effects of inherited experience, made conscious of evil by the aspect of one more powerful than itself, is deterred from attacking, and saves its life by subordinating the primary motive, consisting of craving sensations, to the secondary motive, consisting of ideal feelings, distinct or vague.

Ascending at once from these examples of conduct in animals to examples of human conduct, we shall see that the contrasts between inferior and superior have habitually the same traits. The savage of lowest type devours all the food captured by to-day's chase, and, hungry on the morrow, has perhaps for days to bear the pangs of starvation. The superior savage, conceiving more vividly the entailed sufferings if no game is to be found, is deterred by his complex feeling from giving way entirely to his simple feeling. Similarly are the two contrasted in the inertness which goes along with lack of forethought, and the activity which due forethought produces. The primitive man, idly inclined, and ruled by the sensations of the moment, will not exert himself until actual pains have to be escaped; but the man somewhat advanced, able more distinctly to imagine future gratifications and sufferings, is prompted by the thought of these to overcome his love of ease: decrease of misery and mortality resulting from this predominance of the representative feelings over the presentative feelings.

Without dwelling on the fact that among the civilized, those who lead the life of the senses are contrasted in the same way with those whose lives are largely occupied with pleasures not of a sensual kind, let me point out that there are analogous contrasts between guidance by the less complex representative feelings, or lower emotions, and guidance by the more complex representative feelings, or higher emotions. When led by his acquisitiveness—a re-representative feeling which, acting under due control, conduces to welfare—the thief takes another man's property; his act is determined by certain imagined proximate pleasures of relatively simple kinds, rather than by less clearly imagined possible pains that are more remote and of relatively involved kinds. But in the conscientious man, there is an adequate restraining motive, still more re-representative in its nature, including not only ideas of punishment, and not only ideas of lost reputation and ruin, but including ideas of the claims of the person owning the property, and of the pains which loss of it will entail on him: all joined with a general aversion to acts injurious to others, which arises from the inherited effects of experience. And here at the end we see, as we saw at the beginning, that guidance by the more complex feeling, on the average, conduces to welfare more than does guidance by the simpler feeling.

The like holds with the intellectual co-ordinations through which stimuli issue in motions. The lowest actions, called reflex, in which an impression made on an afferent nerve causes by discharge through an efferent nerve a contraction, shows us a very limited adjustment of acts to ends: the impression being simple, and the resulting motion simple, the internal co-ordination is also simple. Evidently when there are several senses which can be together affected by an outer object; and when, according as such object is discriminated as of one or other kind, the movements made in response are combined in one or other way; the intermediate co-ordinations are necessarily more involved. And evidently each further step in the evolution of intelligence, always instrumental to better self-preservation, exhibits this same general trait. The adjustments by which the more involved actions are made appropriate to the more involved circumstances, imply more intricate, and, consequently, more deliberate and conscious co-ordinations; until, when we come to civilized men, who in their daily business, taking into account many data and conditions, adjust their proceedings to various consequences, we see that the intellectual actions, becoming of the kind we call judicial, are at once very elaborate and very deliberate.

Observe, then, what follows respecting the relative authorities of motives. Throughout the ascent from low creatures up to man, and from the lowest types of man up to the highest, self-preservation has been increased by the subordination of simple excitations to compound excitations—the subjection of immediate sensations to the ideas of sensations to come—the overruling of preservative feelings by representative feelings, and of representative feelings by re-representative feelings. As life has advanced, the accompanying sentiency has become increasingly ideal; and among feelings produced by the compounding of ideas, the highest, and those which have evolved latest, are the re-compounded or doubly ideal. Hence it follows that as guides, the feelings have authorities proportionate to the degrees in which they are removed by their complexity and their ideality from simple sensations and appetites.