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No, say you, the morality consists in the relation of actions to the rule of right; and they are denominated good or ill, according as they agree or disagree with it. What then is this rule of right? In what does it consist? How is it determined? By reason, you say, which examines the moral relations of actions. So that moral relations are determined by the comparison of action to a rule. And that rule is determined by considering the moral relations of objects. Is not this fine reasoning?

All this is metaphysics, you cry. That is enough; there needs nothing more to give a strong presumption of falsehood. Yes, reply I, here are metaphysics surely; but they are all on your side, who advance an abstruse hypothesis, which can never be made intelligible, nor quadrate with any particular instance or illustration. The hypothesis which we embrace is plain. It maintains that morality is determined by sentiment. It defines virtue to be WHATEVER MENTAL ACTION OR QUALITY GIVES TO A SPECTATOR THE PLEASING SENTIMENT OF APPROBATION; and vice the contrary. We then proceed to examine a plain matter of fact, to wit, what actions have this influence. We consider all the circumstances in which these actions agree, and thence endeavour to extract some general observations with regard to these sentiments. If you call this metaphysics, and find anything abstruse here, you need only conclude that your turn of mind is not suited to the moral sciences.

II. When a man, at any time, deliberates concerning his own conduct (as, whether he had better, in a particular emergence, assist a brother or a benefactor), he must consider these separate relations, with all the circumstances and situations of the persons, in order to determine the superior duty and obligation; and in order to determine the proportion of lines in any triangle, it is necessary to examine the nature of that figure, and the relation which its several parts bear to each other. But notwithstanding this appearing similarity in the two cases, there is, at bottom, an extreme difference between them. A speculative reasoner concerning triangles or circles considers the several known and given relations of the parts of these figures; and thence infers some unknown relation, which is dependent on the former. But in moral deliberations we must be acquainted beforehand with all the objects, and all their relations to each other; and from a comparison of the whole, fix our choice or approbation. No new fact to be ascertained; no new relation to be discovered. All the circumstances of the case are supposed to be laid before us, ere we can fix any sentence of blame or approbation. If any material circumstance be yet unknown or doubtful, we must first employ our inquiry or intellectual faculties to assure us of it; and must suspend for a time all moral decision or sentiment. While we are ignorant whether a man were aggressor or not, how can we determine whether the person who killed him be criminal or innocent? But after every circumstance, every relation is known, the understanding has no further room to operate, nor any object on which it could employ itself. The approbation or blame which then ensues, cannot be the work of the judgement, but of the heart; and is not a speculative proposition or affirmation, but an active feeling or sentiment. In the disquisitions of the understanding, from known circumstances and relations, we infer some new and unknown. In moral decisions, all the circumstances and relations must be previously known; and the mind, from the contemplation of the whole, feels some new impression of affection or disgust, esteem or contempt, approbation or blame.

Hence the great difference between a mistake of FACT and one of RIGHT; and hence the reason why the one is commonly criminal and not the other. When Oedipus killed Laius, he was ignorant of the relation, and from circumstances, innocent and involuntary, formed erroneous opinions concerning the action which he committed. But when Nero killed Agrippina, all the relations between himself and the person, and all the circumstances of the fact, were previously known to him; but the motive of revenge, or fear, or interest, prevailed in his savage heart over the sentiments of duty and humanity. And when we express that detestation against him to which he himself, in a little time, became insensible, it is not that we see any relations, of which he was ignorant; but that, for the rectitude of our disposition, we feel sentiments against which he was hardened from flattery and a long perseverance in the most enormous crimes.

In these sentiments then, not in a discovery of relations of any kind, do all moral determinations consist. Before we can pretend to form any decision of this kind, everything must be known and ascertained on the side of the object or action. Nothing remains but to feel, on our part, some sentiment of blame or approbation; whence we pronounce the action criminal or virtuous.

III. This doctrine will become still more evident, if we compare moral beauty with natural, to which in many particulars it bears so near a resemblance. It is on the proportion, relation, and position of parts, that all natural beauty depends; but it would be absurd thence to infer, that the perception of beauty, like that of truth in geometrical problems, consists wholly in the perception of relations, and was performed entirely by the understanding or intellectual faculties. In all the sciences, our mind from the known relations investigates the unknown. But in all decisions of taste or external beauty, all the relations are beforehand obvious to the eye; and we thence proceed to feel a sentiment of complacency or disgust, according to the nature of the object, and disposition of our organs.

Euclid has fully explained all the qualities of the circle; but has not in any proposition said a word of its beauty. The reason is evident. The beauty is not a quality of the circle. It lies not in any part of the line, whose parts are equally distant from a common centre. It is only the effect which that figure produces upon the mind, whose peculiar fabric of structure renders it susceptible of such sentiments. In vain would you look for it in the circle, or seek it, either by your senses or by mathematical reasoning, in all the properties of that figure.

Attend to Palladio and Perrault, while they explain all the parts and proportions of a pillar. They talk of the cornice, and frieze, and base, and entablature, and shaft, and architrave; and give the description and position of each of these members. But should you ask the description and position of its beauty, they would readily reply, that the beauty is not in any of the parts or members of a pillar, but results from the whole, when that complicated figure is presented to an intelligent mind, susceptible to those finer sensations. Till such a spectator appear, there is nothing but a figure of such particular dimensions and proportions: from his sentiments alone arise its elegance and beauty.

Again; attend to Cicero, while he paints the crimes of a Verres or a Catiline. You must acknowledge that the moral turpitude results, in the same manner, from the contemplation of the whole, when presented to a being whose organs have such a particular structure and formation. The orator may paint rage, insolence, barbarity on the one side; meekness, suffering, sorrow, innocence on the other. But if you feel no indignation or compassion arise in you from this complication of circumstances, you would in vain ask him, in what consists the crime or villainy, which he so vehemently exclaims against? At what time, or on what subject it first began to exist? And what has a few months afterwards become of it, when every disposition and thought of all the actors is totally altered or annihilated? No satisfactory answer can be given to any of these questions, upon the abstract hypothesis of morals; and we must at last acknowledge, that the crime or immorality is no particular fact or relation, which can be the object of the understanding, but arises entirely from the sentiment of disapprobation, which, by the structure of human nature, we unavoidably feel on the apprehension of barbarity or treachery.