If an action is moved by desire for an object, Locke asks no questions about origin of the object: But what is to be said of actions, which we only do because we ought?

16. This ambiguous deliverance about moral freedom, it must be observed, is the necessary result on a mind, having too strong a practical hold on life to tamper with human responsibility, of a doctrine which denies the originativeness of thought, and in consequence cannot consistently allow any motive to desire, but the image of a past pleasure or pain. The full logical effect of the doctrine, however, does not appear in Locke, because, with his way of taking any desire of which the satisfaction produces pleasure to have pleasure for its object, he never comes in sight of the question how the manifold objects of actual human interest are possible for a being who only feels and retains, or combines, his feelings. An action moved by love of country, love of fame, love of a friend, love of the beautiful, would cause him no more difficulty than one moved by desire for the renewal of some sensual enjoyment, or for that maintenance of health which is the condition of such enjoyment in the future. If pressed about them, we may suppose that—availing himself of the language probably current in the philosophic society in which he lived, though it first became generally current in England through the writings of his quasi-pupil, Shaftesbury—he would have said that he found in his breast affections for public good, as well as for self-good, the satisfaction of which gave pleasure, and to which his doctrine, that pleasure is the ‘object of desire in general,’ was accordingly applicable. The question—of what feelings or combinations of feelings are the objects which excite these several desires copies?—it does not occur to him to ask. It is only when a class of actions presents itself for which a motive in the way of desire or aversion is not readily assignable that any difficulty arises, and then it is a difficulty which the assignment of such a motive, without any question asked as to its possibility for a merely feeling and imagining subject, is thought sufficiently to dispose of. Such a class of actions is that of which we say that we ‘ought’ to do them, even when we are not compelled and had rather not. We ought, it is generally admitted, to keep our promises, even when it is inconvenient to us to do so and no punishment could overtake us if we did not. We ought to be just even in ways that the law does not prescribe, and when we are beyond its ken; and that, too, in dealing with men towards whom we have no inclination to be generous. We ought even—so at least Locke ‘on the authority of Revelation’ would have said—to forgive injuries which we cannot forget, and if not ‘to love our enemies’ in the literal sense, which may be an impossibility, yet to act as if we did. To what motive are such actions to be assigned?

Their object is pleasure, but pleasure given not by nature but by law.

17. ‘To desire for pleasure or aversion from pain,’ Locke would answer, ‘but a pleasure and pain other than the natural consequences of acts and attached to them by some law.’ This is the result of his enquiry into ‘Moral Relations’ (Book II., chap. 28). Good and evil, he tells us, being ‘nothing but pleasure and pain, moral good or evil is only the conformity or disagreement of our actions to some law, whereby good or evil, i.e., pleasure or pain, is drawn on us by the will and power of the law-maker.’ All law according to its ‘true nature’ is a rule set to the actions of others by an intelligent being, having ‘power to reward the compliance with, and punish deviation from, his rule by some good and evil that is not the natural product and consequence of the action itself; for that, being a natural convenience or inconvenience, would operate of itself without a law.’ Of such law there are three sorts. 1. Divine Law, ‘promulgated to men by the light of nature or voice of revelation, by comparing their actions to which they judge whether, as duties or sins, they are like to procure them happiness or misery from the hands of the Almighty.’ 2. Civil Law, ‘the rule set by the Commonwealth to the actions of those who belong to it,’ reference to which decides ‘whether they be criminal or no.’ 3. ‘The law of opinion or reputation,’ according to agreement or disagreement with which actions are reckoned ‘virtues or vices.’ This law may or may not coincide with the divine law. So far as it does, virtues and vices are really, what they are always supposed to be, actions ‘in their own nature ‘severally right or wrong. It is not as really right or wrong, however, but only as esteemed so, that an act is virtuous or vicious, and thus ‘the common measure of virtue and vice is the approbation or dislike, praise or blame, which by a tacit consent establishes itself in the several societies, tribes, and clubs of men in the world, whereby several actions come to find credit or disgrace among them, according to the judgment, maxims, or fashions of the place.’ Each sort of law has its own ‘enforcement in the way of good and evil.’ That of the civil law is obvious. That of the Divine Law lies in the pleasures and pains of ‘another world,’ which (we have to suppose) render actions ‘in their own nature good and evil.’ That of the third sort of law lies in those consequences of social reputation and dislike which are stronger motives to most men than are the rewards and punishments either of God or the magistrate (chap. 28, §§ 5-12).

Conformity to law not the moral good, but a means to it.

18. ‘Moral goodness or evil,’ Locke concludes, ‘is the conformity or non-conformity of any action’ to one or other of the above rules (§ 14). But such conformity or non-conformity is not a feeling, pleasant or painful, at all. If, then, the account of the good as consisting in pleasure, of which the morally good is a particular form, is to be adhered to, we must suppose that, when moral goodness is said to be conformity to law, it is so called merely with reference to the specific means of attaining that pleasure in which moral good consists. Not the conception of conformity to law, but the imagination of a certain pleasure, will determine the desire that moves the moral act, as every other desire. The distinction between the moral act and an act judiciously done for the sake, let us say, of some pleasure of the palate, will lie only in the channel through which comes the pleasure that each is calculated to obtain. If the motive of an act done for the sake of the pleasure of eating differs from the motive of an act done for the sake of sexual pleasure on account of the difference of the channels through which the pleasures are severally obtained, in that sense only can the motive of either of these acts, upon Locke’s principles, be taken to differ from the motive of an act morally done. The explanation, then, of the acts not readily assignable to desire or aversion, of which we say that we only do them because we ‘ought,’ has been found. They are so far of a kind with all actions done to obtain or avoid what Locke calls ‘future’ pleasures or pains that the difficulty of assigning a motive for them only arises from the fact that their immediate result is not an end but a means. They differ from these, however, inasmuch as the pleasure they draw after them is not their ‘natural consequence,’ any more than the pain attaching to a contrary act would be, but is only possible through the action of God, the magistrate, or society in some of its forms.

Hume has to derive from ‘impressions’ the objects which Locke took for granted.

19. After the above examination we can easily anticipate the points on which a candid and clear-headed man, who accepted the principles of Locke’s doctrine, would see that it needed explanation and development. If all action is determined by impulse to remove the most pressing uneasiness, as consisting in desire for the greatest pleasure of which the agent is at the time capable; if this, again, means desire for the renewal of some ‘impression’ previously experienced, and all impressions are either those of sense or derived from them, how are we to account for those actual objects of human interest and pursuit which seem far removed from any combination of animal pleasures or of the means thereto, and specially for that class of actions determined, as Locke says, by expectation of pain or pleasure other than the ‘natural consequence’ of the act, to which the term ‘moral’ is properly applied? Hume, as we have seen, [1] in accepting Locke’s principles, clothes them in a more precise terminology, marking the distinction between the feeling as originally felt and the same as returning in memory or imagination as that between ‘impression and idea,’ and excluding original ideas of reflection. ‘An impression first strikes upon the senses, and makes us perceive heat or cold, thirst or hunger, pleasure or pain, of some kind or other. Of this impression there is a copy taken by the mind, which remains after the impression ceases; and this we call an idea. This idea of pleasure or pain, when it returns upon the soul, produces the new impressions of desire and aversion, hope and fear, which may properly be called impressions of reflection, because derived from it’ (a). ‘These, again, are copied by the memory and imagination, and become ideas; which perhaps in their turn give rise to other impressions’ (b). Thus the impressions of reflection, marked (a), will be determined by ideas copied from impressions of sense. If desires, they will be desires for the renewal either of a pleasure incidental to the satisfaction of appetite, or of a pleasant sight or sound, a sweet taste or smell. These desires and their satisfactions will again be copied in ideas, but how can the impressions (b) to which these ideas give rise be other than desires for the renewal of the original animal pleasures? How do they come to be desires as unlike these as are the motives which actuate not merely the saint or the philanthropist, but the ordinary good neighbour or honest citizen or head of a family?

[1] General Introd., Vol. I, par. 195

Questions which he found at issue, a. Is virtue interested? b. What is conscience?