The Theory of Moral Sentiments by Adam Smith (1759)
After the inquiry concerning the nature of virtue, the next question of importance in Moral Philosophy, is concerning the principle of approbation, concerning the power or faculty of the mind which renders certain characters agreeable or disagreeable to us, makes us prefer one tenour of conduct to another, denominate the one right and the other wrong, and consider the one as the object of approbation, honour, and reward; the other as that of blame, censure, and punishment.
Three different accounts have been given of this principle of approbation. According to some, we approve and disapprove both of our own actions and of those of others, from self-love only, or from some view of their tendency to our own happiness or disadvantage: according to others, reason, the same faculty by which we distinguish between truth and falsehood, enables us to distinguish between what is fit and unfit both in actions and affections: accorDing to others this distinction is altogether the effect of immediate sentiment and feeling, and arises from the satisfaction or disgust with which the view of certain actions or affections inspires us. Self-love, reason, and sentiment, therefore, are the three different sources which have been assigned for the principle of approbation.
Before I proceed to give an account of those different systems, I must observe, that the determination of this second question, though of the greatest importance in speculation, is of none in practice. The question concerning the nature of virtue necessarily has some influence upon our notions of right and wrong in many particular cases. That concerning the principle of approbation can possibly have no such effect. To examine from what contrivance or mechanism within, those different notions or sentiments arise, is a mere matter of philosophical curiosity.
Those who account for the principle of approbation from self-love, do not all account for it in the same manner, and there is a good deal of confusion and inaccuracy in all their different systems. According to Mr Hobbes, and many of his followers,  man is driven to take refuge in society, not by any natural love which he bears to his own kind, but because without the assistance of others he is incapable of subsisting with ease or safety. Society, upon this account, becomes necessary to him, and whatever tends to its support and welfare, he considers as having a remote tendency to his own interest; and, on the contrary, whatever is likely to disturb or destroy it, he regards as in some measure hurtful or pernicious to himself. Virtue is the great support, and vice the great disturber of human society. The former, therefore, is agreeable, and the latter offensive to every man; as from the one he foresees the prosperity, and from the other the ruin and disorder of what is so necessary for the comfort and security of his existence.
That the tendency of virtue to promote, and of vice to disturb the order of society, when we consider it coolly and philosophically, reflects a very great beauty upon the one, and a very great deformity upon the other, cannot, as I have observed upon a former occasion, be called in question. Human society, when we contemplate it in a certain abstract and philosophical light, appears like a great, an immense machine, whose regular and harmonious movements produce a thousand agreeable effects. As in any other beautiful and noble machine that was the production of human art, whatever tended to render its movements more smooth and easy, would derive a beauty from this effect, and, on the contrary, whatever tended to obstruct them would displease upon that account: so virtue, which is, as it were, the fine polish to the wheels of society, necessarily pleases; while vice, like the vile rust, which makes them jar and grate upon one another, is as necessarily offensive. This account, therefore, of the origin of approbation and disapprobation, so far as it derives them from a regard to the order of society, runs into that principle which gives beauty to utility, and which I have explained upon a former occasion; and it is from thence that this system derives all that appearance of probability which it possesses. When those authors describe the innumerable advantages of a cultivated and social, above a savage and solitary life; when they expatiate upon the necessity of virtue and good order for the maintenance of the one, and demonstrate how infallibly the prevalence of vice and disobedience to the laws tend to bring back the other, the reader is charmed with the novelty and grandeur of those views which they open to him: he sees plainly a new beauty in virtue, and a new deformity in vice, which he had never taken notice of before, and is commonly so delighted with the discovery, that he seldom takes time to reflect, that this political view, having never occurred to him in his life before, cannot possibly be the ground of that approbation and disapprobation with which he has always been accustomed to consider those different qualities.
When those authors, on the other hand, deduce from self-love the interest which we take in the welfare of society, and the esteem which upon that account we bestow upon virtue, they do not mean, that when we in this age applaud the virtue of Cato, and detest the villany of Catiline, our sentiments are influenced by the notion of any benefit we receive from the one, or of any detriment we suffer from the other. It was not because the prosperity or subversion of society, in those remote ages and nations, was apprehended to have any influence upon our happiness or misery in the present times; that according to those philosophers, we esteemed the virtuous, and blamed the disorderly characters. They never imagined that our sentiments were influenced by any benefit or damage which we supposed actually to redound to us, from either; but by that which might have redounded to us, had we lived in those distant ages and countries; or by that which might still redound to us, if in our own times we should meet with characters of the same kind. The idea, in short, which those authors were groping about, but which they were never able to unfold distinctly, was that indirect sympathy which we feel with the gratitude or resentment of those who received the benefit or suffered the damage resulting from such opposite characters: and it was this which they were indistinctly pointing at, when they said, that it was not the thought of what we had gained or suffered which prompted our applause or indignation, but the conception or imagination of what we might gain or suffer if we were to act in society with such associates.
Sympathy, however, cannot, in any sense, be regarded as a selfish principle. When I sympathize with your sorrow or your indignation, it may be pretended, indeed, that my emotion is founded in self-love, because it arises from bringing your case home to myself, from putting myself in your situation, and thence conceiving what I should feel in the like circumstances. But though sympathy is very properly said to arise from an imaginary change of situations with the person principally concerned, yet this imaginary change is not supposed to happen to me in my own person and character, but in that of the person with whom I sympathize. When I condole with you for the loss of your only son, in order to enter into your grief I do not consider what I, a person of such a character and profession, should suffer, if I had a son, and if that son was unfortunately to die: but I consider what I should suffer if I was really you, and I not only change circumstances with you, but I change persons and characters. My grief, therefore, is entirely upon your account, and not in the least upon my own. It is not, therefore, in the least selfish. How can that be regarded as a selfish passion, which does not arise even from the imagination of any thing that has befallen, or that relates to myself, in my own proper person and character, but which is entirely occupied about what relates to you? A man may sympathize with a woman in child-bed; though it is impossible that he should conceive himself as suffering her pains in his own proper person and character. That whole account of human nature, however, which deduces all sentiments and affections from self-love, which has made so much noise in the world, but which, so far as I know, has never yet been fully and distinctly explained, seems to me to have arisen from some confused misapprehension of the system of sympathy.
It is well known to have been the doctrine of Mr Hobbes, that a state of nature is a state of war; and that antecedent to the institution of civil government there could be no safe or peaceable society among men. To preserve society, therefore, according to him, was to support civil government, and to destroy civil government was the same thing as to put an end to society. But the existence of civil government depends upon the obedience that is paid to the supreme magistrate. The moment he loses his authority, all government is at an end. As self-preservation, therefore, teaches men to applaud whatever tends to promote the welfare of society, and to blame whatever is likely to hurt it; so the same principle, if they would think and speak consistently, ought to teach them to applaud upon all occasions obedience to the civil magistrate, and to blame all disobedience and rebellion. The very ideas of laudable and blamable, ought to be the same with those of obedience and disobedience. The laws of the civil magistrate, therefore, ought to be regarded as the sole ultimate standards of what was just and unjust, of what was right and wrong.
It was the avowed intention of Mr Hobbes, by propagating these notions, to subject the consciences of men immediately to the civil, and not to the ecclesiastical powers, whose turbulence and ambition, he had been taught, by the example of his own times, to regard as the principal source of the disorders of society. His doctrine, upon this account, was peculiarly offensive to theologians, who accorDingly did not fail to vent their indignation against him with great asperity and bitterness. It was likewise offensive to all sound moralists, as it supposed that there was no natural distinction between right and wrong, that these were mutable and changeable, and depended upon the mere arbitrary will of the civil magistrate. This account of things, therefore, was attacked from all quarters, and by all sorts of weapons, by sober reason as well as by furious declamation.
In order to confute so odious a doctrine, it was necessary to prove, that antecedent to all law or positive institution, the mind was naturally endowed with a faculty, by which it distinguished in certain actions and affections, the qualities of right, laudable, and virtuous, and in others those of wrong, blamable, and vicious.
Law, it was justly observed by Dr Cudworth,  could not be the original source of those distinctions; since upon the supposition of such a law, it must either be right to obey it, and wrong to disobey it, or indifferent whether we obeyed it, or disobeyed it. That law which it was indifferent whether we obeyed or disobeyed, could not, it was evident, be the source of those distinctions; neither could that which it was right to obey and wrong to disobey, since even this still supposed the antecedent notions or ideas of right and wrong, and that obedience to the law was conformable to the idea of right, and disobedience to that of wrong.
Since the mind, therefore, had a notion of those distinctions antecedent to all law, it seemed necessarily to follow, that it derived this notion from reason, which pointed out the difference between right and wrong, in the same manner in which it did that between truth and falsehood: and this conclusion, which, though true in some respects, is rather hasty in others, was more easily received at a time when the abstract science of human nature was but in its infancy, and before the distinct offices and powers of the different faculties of the human mind had been carefully examined and distinguished from one another. When this controversy with Mr Hobbes was carried on with the greatest warmth and keenness, no other faculty had been thought of from which any such ideas could possibly be supposed to arise. It became at this time, therefore, the popular doctrine, that the essence of virtue and vice did not consist in the conformity or disagreement of human actions with the law of a superior, but in their conformity or disagreement with reason, which was thus considered as the original source and principle of approbation and disapprobation.
That virtue consists in conformity to reason, is true in some respects, and this faculty may very justly be considered as, in some sense, the source and principle of approbation and disapprobation, and of all solid judgments concerning right and wrong. It is by reason that we discover those general rules of justice by which we ought to regulate our actions: and it is by the same faculty that we form those more vague and indeterminate ideas of what is prudent, of what is decent, of what is generous or noble, which we carry constantly about with us, and according to which we endeavour, as well as we can, to model the tenor of our conduct. The general maxims of morality are formed, like all other general maxims, from experience and induction. We observe in a great variety of particular cases what pleases or displeases our moral faculties, what these approve or disapprove of, and, by induction from this experience, we establish those general rules. But induction is always regarded as one of the operations of reason. From reason, therefore, we are very properly said to derive all those general maxims and ideas. It is by these, however, that we regulate the greater part of our moral judgments, which would be extremely uncertain and precarious if they depended altogether upon what is liable to so many variations as immediate sentiment and feeling, which the different states of health and humour are capable of altering so essentially. As our most solid judgments, therefore, with regard to right and wrong, are regulated by maxims and ideas derived from an induction of reason, virtue may very properly be said to consist in a conformity to reason, and so far this faculty may be considered as the source and principle of approbation and disapprobation.
But though reason is undoubtedly the source of the general rules of morality, and of all the moral judgments which we form by means of them; it is altogether absurd and unintelligible to suppose that the first perceptions of right and wrong can be derived from reason, even in those particular cases upon the experience of which the general rules are formed. These first perceptions, as well as all other experiments upon which any general rules are founded, cannot be the object of reason, but of immediate sense and feeling. It is by finding in a vast variety of instances that one tenor of conduct constantly pleases in a certain manner, and that another as constantly displeases the mind, that we form the general rules of morality. But reason cannot render any particular object either agreeable or disagreeable to the mind for its own sake. Reason may show that this object is the means of obtaining some other which is naturally either pleasing or displeasing, and in this manner may render it either agreeable or disagreeable for the sake of something else. But nothing can be agreeable or disagreeable for its own sake, which is not rendered such by immediate sense and feeling. If virtue, therefore, in every particular instance, necessarily pleases for its own sake, and if vice as certainly displeases the mind, it cannot be reason, but immediate sense and feeling, which, in this manner, reconciles us to the one, and alienates us from the other.
Pleasure and pain are the great objects of desire and aversion: but these are distinguished not by reason, but by immediate sense and feeling. If virtue, therefore, be desirable for its own sake, and if vice be, in the same manner, the object of aversion, it cannot be reason which originally distinguishes those different qualities, but immediate sense and feeling.
As reason, however, in a certain sense, may justly be considered as the principle of approbation and disapprobation, these sentiments were, through inattention, long regarded as originally flowing from the operations of this faculty. Dr Hutcheson had the merit of being the first who distinguished with any degree of precision in what respect all moral distinctions may be said to arise from reason, and in what respect they are founded upon immediate sense and feeling. In his illustrations upon the moral sense he has explained this so fully, and, in my opinion, so unanswerably, that, if any controversy is still kept up about this subject, I can impute it to nothing, but either to inattention to what that gentleman has written, or to a superstitious attachment to certain forms of expression, a weakness not very uncommon among the learned, especially in subjects so deeply interesting as the present, in which a man of virtue is often loath to abandon, even the propriety of a single phrase which he has been accustomed to.
Those systems which make sentiment the principle of approbation may be divided into two different classes.
I. According to some the principle of approbation is founded upon a sentiment of a peculiar nature, upon a particular power of perception exerted by the mind at the view of certain actions or affections; some of which affecting this faculty in an agreeable and others in a disagreeable manner, the former are stamped with the characters of right, laudable, and virtuous; the latter with those of wrong, blamable, and vicious. This sentiment being of a peculiar nature distinct from every other, and the effect of a particular power of perception, they give it a particular name, and call it a moral sense.
II. According to others, in order to account for the principle of approbation, there is no occasion for supposing any new power of perception which had never been heard of before: Nature, they imagine, acts here, as in all other cases, with the strictest oeconomy, and produces a multitude of effects from one and the same cause; and sympathy, a power which has always been taken notice of, and with which the mind is manifestly endowed, is, they think, sufficient to account for all the effects ascribed to this peculiar faculty.
I. Dr Hutcheson  had been at great pains to prove that the principle of approbation was not founded on self-love. He had demonstrated too that it could not arise from any operation of reason. Nothing remained, he thought, but to suppose it a faculty of a peculiar kind, with which Nature had endowed the human mind, in order to produce this one particular and important effect. When self-love and reason were both excluded, it did not occur to him that there was any other known faculty of the mind which could in any respect answer this purpose.
This new power of perception he called a moral sense, and supposed it to be somewhat analogous to the external senses. As the bodies around us, by affecting these in a certain manner, appear to possess the different qualities of sound, taste, odour, colour; so the various affections of the human mind, by touching this particular faculty in a certain manner, appear to possess the different qualities of amiable and odious, of virtuous and vicious, of right and wrong.
The various senses or powers of perception,  from which the human mind derives all its simple ideas, were, according to this system, of two different kinds, of which the one were called the direct or antecedent, the other, the reflex or consequent senses. The direct senses were those faculties from which the mind derived the perception of such species of things as did not presuppose the antecedent perception of any other. Thus sounds and colours were objects of the direct senses. To hear a sound or to see a colour does not presuppose the antecedent perception of any other quality or object. The reflex or consequent senses, on the other hand, were those faculties from which the mind derived the perception of such species of things as presupposed the antecedent perception of some other. Thus harmony and beauty were objects of the reflex senses. In order to perceive the harmony of a sound, or the beauty of a colour, we must first perceive the sound or the colour. The moral sense was considered as a faculty of this kind. That faculty, which Mr Locke calls reflection, and from which he derived the simple ideas of the different passions and emotions of the human mind, was, according to Dr Hutcheson, a direct internal sense. That faculty again by which we perceived the beauty or deformity, the virtue or vice of those different passions and emotions, was a reflex, internal sense.
Dr Hutcheson endeavoured still further to support this doctrine, by shewing that it was agreeable to the analogy of nature, and that the mind was endowed with a variety of other reflex senses exactly similar to the moral sense; such as a sense of beauty and deformity in external objects; a public sense, by which we sympathize with the happiness or misery of our fellow-creatures; a sense of shame and honour, and a sense of ridicule.
But notwithstanding all the pains which this ingenious philosopher has taken to prove that the principle of approbation is founded in a peculiar power of perception, somewhat analogous to the external senses, there are some consequences, which he acknowledges to follow from this doctrine, that will, perhaps, be regarded by many as a sufficient confutation of it. The qualities he allows,  which belong to the objects of any sense, cannot, without the greatest absurdity, be ascribed to the sense itself. Who ever thought of calling the sense of seeing black or white, the sense of hearing loud or low, or the sense of tasting sweet or bitter? And, according to him, it is equally absurd to call our moral faculties virtuous or vicious, morally good or evil. These qualities belong to the objects of those faculties, not to the faculties themselves. If any man, therefore, was so absurdly constituted as to approve of cruelty and injustice as the highest virtues, and to disapprove of equity and humanity as the most pitiful vices, such a constitution of mind might indeed be regarded as inconvenient both to the individual and to the society, and likewise as strange, surprising, and unnatural in itself; but it could not, without the greatest absurdity, be denominated vicious or morally evil.
Yet surely if we saw any man shouting with admiration and applause at a barbarous and unmerited execution, which some insolent tyrant had ordered, we should not think we were guilty of any great absurdity in denominating this behaviour vicious and morally evil in the highest degree, though it expressed nothing but depraved moral faculties, or an absurd approbation of this horrid action, as of what was noble, magnanimous, and great. Our heart, I imagine, at the sight of such a spectator, would forget for a while its sympathy with the sufferer, and feel nothing but horror and detestation, at the thought of so execrable a wretch. We should abominate him even more than the tyrant who might be goaded on by the strong passions of jealousy, fear, and resentment, and upon that account be more excusable. But the sentiments of the spectator would appear altogether without cause or motive, and therefore most perfectly and completely detestable. There is no perversion of sentiment or affection which our heart would be more averse to enter into, or which it would reject with greater hatred and indignation than one of this kind; and so far from regarding such a constitution of mind as being merely something strange or inconvenient, and not in any respect vicious or morally evil, we should rather consider it as the very last and most dreadful stage of moral depravity.
Correct moral sentiments, on the contrary, naturally appear in some degree laudable and morally good. The man, whose censure and applause are upon all occasions suited with the greatest accuracy to the value or unworthiness of the object, seems to deserve a degree even of moral approbation. We admire the delicate precision of his moral sentiments: they lead our own judgments, and, upon account of their uncommon and surprising justness, they even excite our wonder and applause. We cannot indeed be always sure that the conduct of such a person would be in any respect correspondent to the precision and accuracy of his judgments concerning the conduct of others. Virtue requires habit and resolution of mind, as well as delicacy of sentiment; and unfortunately the former qualities are sometimes wanting, where the latter is in the greatest perfection. This disposition of mind, however, though it may sometimes be attended with imperfections, is incompatible with any thing that is grossly criminal, and is the happiest foundation upon which the superstructure of perfect virtue can be built. There are many men who mean very well, and seriously purpose to do what they think their duty, who notwithstanding are disagreeable on account of the coarseness of their moral sentiments.
It may be said, perhaps, that though the principle of approbation is not founded upon any power of perception that is in any respect analogous to the external senses, it may still be founded upon a peculiar sentiment which answers this one particular purpose and no other. Approbation and disapprobation, it may be pretended, are certain feelings or emotions which arise in the mind upon the view of different characters and actions; and as resentment might be called a sense of injuries, or gratitude a sense of benefits, so these may very properly receive the name of a sense of right and wrong, or of a moral sense.
But this account of things, though it may not be liable to the same objections with the foregoing, is exposed to others which are equally unanswerable.
First of all, whatever variations any particular emotion may undergo, it still preserves the general features which distinguish it to be an emotion of such a kind, and these general features are always more striking and remarkable than any variation which it may undergo in particular cases. Thus anger is an emotion of a particular kind: and accordingly its general features are always more distinguishable than all the variations it undergoes in particular cases. Anger against a man is, no doubt, somewhat different from anger against a woman, and that again from anger against a child. In each of those three cases, the general passion of anger receives a different modification from the particular character of its object, as may easily be observed by the attentive. But still the general features of the passion predominate in all these cases. To distinguish these, requires no nice observation: a very delicate attention, on the contrary, is necessary to discover their variations: every body takes notice of the former; scarce any body observes the latter. If approbation and disapprobation, therefore, were, like gratitude and resentment, emotions of a particular kind, distinct from every other, we should expect that in all the variations which either of them might undergo, it would still retain the general features which mark it to be an emotion of such a particular kind, clear, plain, and easily distinguishable. But in fact it happens quite otherwise. If we attend to what we really feel when upon different occasions we either approve or disapprove, we shall find that our emotion in one case is often totally different from that in another, and that no common features can possibly be discovered between them. Thus the approbation with which we view a tender, delicate, and humane sentiment, is quite different from that with which we are struck by one that appears great, daring, and magnanimous. Our approbation of both may, upon different occasions, be perfect and entire; but we are softened by the one, and we are elevated by the other, and there is no sort of resemblance between the emotions which they excite in us. But according to that system which I have been endeavouring to establish, this must necessarily be the case. As the emotions of the person whom we approve of, are, in those two cases, quite opposite to one another, and as our approbation arises from sympathy with those opposite emotions, what we feel upon the one occasion, can have no sort of resemblance to what we feel upon the other. But this could not happen if approbation consisted in a peculiar emotion which had nothing in common with the sentiments we approved of, but which arose at the view of those sentiments, like any other passion at the view of its proper object. The same thing holds true with regard to disapprobation. Our horror for cruelty has no sort of resemblance to our contempt for mean-spiritedness. It is quite a different species of discord which we feel at the view of those two different vices, between our own minds and those of the person whose sentiments and behaviour we consider.
Secondly, I have already observed, that not only the different passions or affections of the human mind which are approved or disapproved of, appear morally good or evil, but that proper and improper approbation appear, to our natural sentiments, to be stamped with the same characters. I would ask, therefore, how it is, that, according to this system, we approve or disapprove of proper or improper approbation? To this question there is, I imagine, but one reasonable answer, which can possibly be given. It must be said, that when the approbation with which our neighbour regards the conduct of a third person coincides with our own, we approve of his approbation, and consider it as, in some measure, morally good; and that, on the contrary, when it does not coincide with our own sentiments, we disapprove of it, and consider it as, in some measure, morally evil. It must be allowed, therefore, that, at least in this one case, the coincidence or opposition of sentiments, between the observer and the person observed, constitutes moral approbation or disapprobation. And if it does so in this one case, I would ask, why not in every other? Or to what purpose imagine a new power of perception in order to account for those sentiments?
Against every account of the principle of approbation, which makes it depend upon a peculiar sentiment, distinct from every other, I would object; that it is strange that this sentiment, which Providence undoubtedly intended to be the governing principle of human nature, should hitherto have been so little taken notice of, as not to have got a name in any language. The word moral sense is of very late formation, and cannot yet be considered as making part of the English tongue. The word approbation has but within these few years been appropriated to denote peculiarly any thing of this kind. In propriety of language we approve of whatever is entirely to our satisfaction, of the form of a building, of the contrivance of a machine, of the flavour of a dish of meat. The word conscience does not immediately denote any moral faculty by which we approve or disapprove. Conscience supposes, indeed, the existence of some such faculty, and properly signifies our consciousness of having acted agreeably or contrary to its directions. When love, hatred, joy, sorrow, gratitude, resentment, with so many other passions which are all supposed to be the subjects of this principle, have made themselves considerable enough to get titles to know them by, is it not surprising that the sovereign of them all should hitherto have been so little heeded, that, a few philosophers excepted, nobody has yet thought it worth while to bestow a name upon it?
When we approve of any character or action, the sentiments which we feel, are, according to the foregoing system, derived from four sources, which are in some respects different from one another. First, we sympathize with the motives of the agent; secondly, we enter into the gratitude of those who receive the benefit of his actions; thirdly, we observe that his conduct has been agreeable to the general rules by which those two sympathies generally act; and, last of all, when we consider such actions as making a part of a system of behaviour which tends to promote the happiness either of the individual or of the society, they appear to derive a beauty from this utility, not unlike that which we ascribe to any well-contrived machine. After deducting, in any one particular case, all that must be acknowledged to proceed from some one or other of these four principles, I should be glad to know what remains, and I shall freely allow this overplus to be ascribed to a moral sense, or to any other peculiar faculty, provided any body will ascertain precisely what this overplus is. It might be expected, perhaps, that if there was any such peculiar principle, such as this moral sense is supposed to be, we should feel it, in some particular cases, separated and detached from every other, as we often feel joy, sorrow, hope, and fear, pure and unmixed with any other emotion. This however, I imagine, cannot even be pretended. I have never heard any instance alleged in which this principle could be said to exert itself alone and unmixed with sympathy or antipathy, with gratitude or resentment, with the perception of the agreement or disagreement of any action to an established rule, or last of all with that general taste for beauty and or der which is excited by inanimated as well as by animated objects.
II. There is another system which attempts to account for the origin of our moral sentiments from sympathy, distinct from that which I have been endeavouring to establish. It is that which places virtue in utility, and accounts for the pleasure with which the spectator surveys the utility of any quality from sympathy with the happiness of those who are affected by it. This sympathy is different both from that by which we enter into the motives of the agent, and from that by which we go along with the gratitude of the persons who are benefited by his actions. It is the same principle with that by which we approve of a well-contrived machine. But no machine can be the object of either of those two last mentioned sympathies. I have already, in the fourth part of this discourse, given some account of this system.
15. Puffendorff, Mandeville.
16. Immutable Morality, l. 1.
17. Inquiry concerning Virtue.
18. Treatise of the Passions.
19. Illustrations upon the Moral Sense, sect. 1, p. 237, et seq.; third edition.