The cause of this singular and seemingly unreasonable circumstance (that is, its analogy to the rest of the phenomena of the human mind,) belongs not to the present purpose. It is sufficient if the effect be beyond dispute.

XXVII. 22. Of a man's connexions in the way of antipathy, there needs not any thing very particular to be observed. Happily there is no primeval and constant source of antipathy in a human nature, as there is of sympathy. There are no permanent sets of persons who are naturally and of course the objects of antipathy to a man, as there are who are the objects of the contrary affection. Sources, however, but too many, of antipathy, are apt to spring up upon various occasions during the course of a man's life: and whenever they do, this circumstance may have a very considerable influence on the effects of various exciting causes. As on the one hand, a punishment, for instance, which tends to separate a man from those with whom he is connected in the way of sympathy, so on the other hand, one which tends to force him into the company of those with whom he is connected in the way of antipathy, will, on that account, be so much the more distressing. It is to be observed, that sympathy itself multiplies the sources of antipathy. Sympathy for your friend gives birth to antipathy on your part against all those who are objects of antipathy, as well as to sympathy for those who are objects of sympathy to him. In the same manner does antipathy multiply the sources of sympathy; though commonly perhaps with rather a less degree of efficacy. Antipathy against your enemy is apt to give birth to sympathy on your part towards those who are objects of antipathy, as well as to antipathy against those who are objects of sympathy, to him.

XXVIII. 23. Thus much for the circumstances by which the effect of any exciting cause may be influenced, when applied upon any given occasion, at any given period. But besides these supervening incidents, there are other circumstances relative to a man, that may have their influence, and which are co-eval to his birth. In the first place, it seems to be universally agreed, that in the original frame or texture of every man's body, there is a something which, independently of all subsequently intervening circumstances, renders him liable to be affected by causes producing bodily pleasure or pain, in a manner different from that in which another man would be affected by the same causes. To the catalogue of circumstances influencing a man's sensibility, we may therefore add his original or radical frame, texture, constitution, or temperament of body.

XXIX. 24. In the next place, it seems to be pretty well agreed, that there is something also in the original frame or texture of every man's mind, which, independently of all exterior and subsequently intervening circumstances, and even of his radical frame of body, makes him liable to be differently affected by the same exciting causes, from what another man would be. To the catalogue of circumstances influencing a man's sensibility, we may therefore further add his original or radical frame, texture, constitution or temperament of mind.

XXX. It seems pretty certain, all this while, that a man's sensibility to causes producing pleasure or pain, even of mind, may depend in a considerable degree upon his original and acquired frame of body. But we have no reason to think that it can depend altogether upon that frame: since, on the one hand, we see persons whose frame of body is as much alike as can be conceived, differing very considerably in respect of their mental frame: and, on the other hand, persons whose frame of mind is as much alike as can be conceived, differing very conspicuously in regard to their bodily frame.

XXXI. It seems indisputable also, that the different sets of a external occurrences that may befall a man in the course of his life, will make great differences in the subsequent texture of his mind at any given period: yet still those differences are not solely to be attributed to such occurrences. Equally far from the truth seems that opinion to be (if any such be maintained) which attributes all to nature, and that which attributes all to education. The two circumstances will therefore still remain distinct, as well from one another, as from all others.

XXXII. Distinct however as they are, it is manifest, that at no period in the active part of a man's life can they either of them make their appearance by themselves. All they do is to constitute the latent ground-work which the other supervening circumstances have to work upon and whatever influence those original principles may have, is so changed and modified, and covered over, as it were, by those other circumstances, as never to be separately discernible. The effects of the one influence are indistinguishably blended with those of the other.

XXXIII. The emotions of the body are received, and with reason, as probable indications of the temperature of the mind. But they are far enough from conclusive. A man may exhibit, for instance, the exterior appearances of grief, without really grieving at all, or at least in any thing near the proportion in which he appears to grieve.