ADVERTISEMENT. In the first copy of these Papers, I had inserted the two following Dissertations into the Chapters, "Of a Future Life," and, "Of the Moral Government of God;" with which they are closely connected. But as they do not directly fall under the title of the foregoing Treatise, and would have kept the subject of it too long out of sight; it seemed more proper to place them by themselves. DISSERTATION I. OF PERSONAL IDENTITY. WHETHER We are to live in a future state, as it is the most important question which can possibly be asked, so it is the most intelligible one which can be expressed in language. Yet strange perplexities have been raised about the meaning of that identity or sameness of person, which is implied in the notion of our living now and hereafter, or in any two successive moments. And the solution of these difficulties hath been stranger than the difficulties themselves. For, personal identity has been explained so by some, as to render the inquiry concerning a future life of no consequence at all to us the persons who are making it. And though few men can be misled by such subtleties; yet it may be proper a little to consider them. Now, when it is asked wherein personal identity consists, the answer should be the same, as if it were asked wherein consists similitude, or equality; that all attempts to define would but perplex it. Yet there is no difficulty at all in ascertaining the idea. For as, upon two triangles being compared or viewed together, there arises to the mind the idea of similitude; or upon twice two and four, the idea of equality: so likewise, upon comparing the consciousness of one's self, or one's own existence, in any two moments, there as immediately arises to the mind the idea of personal identity. And as the two former comparisons not only give us the ideas of similitude and equality; but also show us, that two triangles are alike, and twice two and four are equal: so the latter comparison not only gives us the idea of personal identity, but also shows us the identity of ourselves in those two moments; the present, suppose, and that immediately past; or the present, and that a month, a year, or twenty years past. Or in other words, by reflecting upon that which is myself now, and that which was myself twenty years ago, I discern they are not two, but one and the same self. But though consciousness of what is past does thus ascertain our personal identity to ourselves, yet to say, that it makes personal identity, or is necessary to our being the same persons, is to say, that a person has not existed a single moment, nor done one action, but what he can remember; indeed none but what he reflects upon. And one should really think it self-evident, that consciousness of personal identity presupposes, and therefore cannot constitute, personal identity; any more than knowledge, in any other case, can constitute truth, which it presupposes. This wonderful mistake may possibly have arisen from hence; that to be endued with consciousness is inseparable from the idea of a person, or intelligent being. For, this might be expressed inaccurately thus, that consciousness makes personality: and from hence it might be concluded to make personal identity. But though present consciousness of what we at present do and feel is necessary to our being the persons we now are; yet present consciousness of past actions or feelings is not necessary to our being the same persons who performed those actions, or had those feelings. The inquiry, what makes vegetables the same in the common acceptation of the word, does not appear to have any relation to this of personal identity: because, the word same, when applied to them and to person, is not only applied to different subjects, but it is also used in different senses. For when a man swears to the same tree, as having stood fifty years in the same place, he means only the same as to all the purposes of property and uses of common life, and not that the tree has been all that time the same in the strict philosophical sense of the word. For he does not know, whether any one particle of the present tree be the same with any one particle of the tree which stood in the same place fifty years ago. And if they have not one common particle of matter, they cannot be the same tree in the proper philosophic sense of the word same: it being evidently a contradiction in terms, to say they are, when no part of their substance, and no one of their properties is the same: no part of their substance, by the supposition; no one of their properties, because it is allowed, that the same property cannot be transferred from one substance to another. And therefore when we say the identity or sameness of a plant consists in a continuation of the same life, communicated under the same organization, to a number of particles of matter, whether the same or not; the word same, when applied to life and to organization, cannot possibly be understood to signify, what it signifies in this very sentence, when applied to matter. In a loose and popular sense then, the life and the organization and the plant are justly said to be the same, notwithstanding the perpetual change of the parts. But in a strict and philosophical manner of speech, no man, no being, no mode of being, no anything, can be the same with that, with which it has indeed nothing the same. Now sameness is used in this latter sense, when applied to persons. The identity of these, therefore, cannot subsist with diversity of substance. * The thing here considered, and demonstratively, as I think, determined, is proposed by Mr Locke in these words, Whether it, i. e. the same self or person, be the same identical substance? And he has suggested what is a much better answer to the question, than that which he gives it in form. For he defines Person, a thinking intelligent being, &c., and personal identity, the sameness of a rational Being. The question then is, whether the same rational being is the same substance: which needs no answer, because Being and Substance, in this place, stand for the same idea. The ground of the doubt, whether the same person be the same substance, is said to be this; that the consciousness of our own existence, in youth and in old age, or in any two joint successive moments, is not the same individual action,t i. e. not the same consciousness, but different successive consciousnesses. Now it is strange that this should have occasioned such perplexities. For it is surely conceivable, that a person may have a capacity of knowing some object or other to be the same now, which it was when he † Lock3, p. 146, 147. * Locke's Works, vol. i. p. 146. |