From these two relations, viz. resemblance and a parallel desire, there arises such a connexion betwixt the sense of beauty, the bodily appetite, and benevolence, that they become in a manner inseparable; and we find from experience, that 'tis indifferent which of them advances first, since any of them is almost sure to be attended with the related affections. One who is inflamed with lust, feels at least a momentary kindness towards the object of it, and at the same time fancies her more beautiful than ordinary; as there are many, who begin with kindness and esteem for the wit and merit of the person, and advance from that to the other passions. But the most common species of love is that which first arises from beauty, and afterwards diffuses itself into kindness, and into the bodily appetite. Kindness or esteem, and the appetite to generation, are too remote to unite easily together. The one is, perhaps, the most refined passion of the soul, the other the most gross and vulgar. The love of beauty is placed in a just medium betwixt them, and partakes of both their natures; from whence it proceeds, that 'tis so singularly fitted to produce both.
This account of love is not peculiar to my system, but is unavoidable on any hypothesis. The three affections which compose this passion are evidently distinct, and has each of them its distinct object. 'Tis certain, therefore, that 'tis only by their relation they produce each other. But the relation of passions is not alone sufficient. 'Tis likewise necessary there should be a relation of ideas. The beauty of one person never inspires us with love for another. This then is a sensible proof of the double relation of impressions and ideas. From one instance so evident as this we may form a judgment of the rest.
This may also serve in another view to illustrate what I have insisted on concerning the origin of pride and humility, love and hatred. I have observed, that though self be the object of the first set of passions, and some other person of the second, yet these objects cannot alone be the causes of the passions, as having each of them a relation to two contrary affections, which must from the very first moment destroy each other. Here then is the situation of the mind, as I have already described it. It has certain organs naturally fitted to produce a passion; that passion, when produced, naturally turns the view to a certain object. But this not being sufficient to produce the passion, there is required some other emotion, which, by a double relation of impressions and ideas, may set these principles in action, and bestow on them their first impulse. This situation is still more remarkable with regard to the appetite of generation. Sex is not only the object, but also the cause of the appetite. We not only turn our view to it, when actuated by that appetite, but the reflecting on it suffices to excite the appetite. But as this cause loses its force by too great frequency, 'tis necessary it should be quickened by some new impulse; and that impulse we find to arise from the beauty of the person; that is, from a double relation of impressions and ideas. Since this double relation is necessary where an affection has both a distinct cause and object, how much more so where it has only a distinct object without any determinate cause!
[SECTION XII.]
OF THE LOVE AND HATRED OF ANIMALS.
But to pass from the passions of love and hatred, and from their mixtures and compositions, as they appear in man, to the same affections as they display themselves in brutes, we may observe, not only that love and hatred are common to the whole sensitive creation, but likewise that their causes, as above explained, are of so simple a nature that they may easily be supposed to operate on mere animals. There is no force of reflection or penetration required. Every thing is conducted by springs and principles, which are not peculiar to man, or any one species of animals. The conclusion from this is obvious in favour of the foregoing system.
Love, in animals, has not for its only object animals of the same species, but extends itself farther, and comprehends almost every sensible and thinking being. A dog naturally loves a man above his own species, and very commonly meets with a return of affection.
As animals are but little susceptible either of the pleasures or pains of the imagination, they can judge of objects only by the sensible good or evil which they produce, and from that must regulate their affections towards them. Accordingly we find, that by benefits or injuries we produce their love or hatred; and that, by feeding and cherishing any animal, we quickly acquire his affections; as by beating and abusing him we never fail to draw on us his enmity and ill-will.
Love in beasts is not caused so much by relation as in our species; and that because their thoughts are not so active as to trace relations, except in very obvious instances. Yet 'tis easy to remark, that on some occasions it has a considerable influence upon them. Thus, acquaintance, which has the same effect as relation, always produces love in animals, either to men or to each other. For the same reason, any likeness among them is the source of affection. An ox confined to a park with horses, will naturally join their company, if I may so speak, but always leaves it to enjoy that of his own species, where he has the choice of both.