The case of Belief in past existences which have not been the object of our senses, resolves itself into the belief, either of testimony, or of the uniformity of the laws of nature; both of which will, after a few intervening expositions, be fully explained.
3. The process which we denote by the words, 361 “Belief in future events,” deserves, on account of its importance, to be very carefully considered. That it is a complex process, will very speedily appear. Our endeavour shall be to resolve it into its elements; in doing which, we shall see whether it consists wholly of the elements with which we have now become familiar, or whether it is necessary to admit the existence of something else.
I believe that, to-morrow, the light of day will be spread over England; that the tide will ebb and flow at London-bridge; that men, and houses, and waggons, and carriages, will be seen in the streets of this metropolis; that ships will sail, and coaches arrive; that shops will be opened for their customers, manufactories for their workmen, and that the Exchange will, at a certain hour, be crowded with merchants. Now, in all this, what is involved?
First of all, in the Belief of any future event, there is, of course, involved the idea of the event. It will be immediately understood, from what has been already adduced, that there can be no Belief in any existence, without an idea of that existence. If I believe in the light of day to-morrow, I must have an idea of it; if I believe in the flux and reflux of the water at London-bridge, I must have ideas of those several objects; and so of all other things.
In the next place; as it has already been shewn, that we cannot call up any idea by willing it; and that none of our ideas comes into existence but by association; the idea which forms the fundamental part of Belief is produced by association. Ideas and association, then, are necessary parts of belief.
362 But there can be no idea of the future; because, strictly speaking, the future is a nonentity. Of nothing there can be no idea. It is true we can have an idea of that which never existed, and which we do not suppose ever will exist, as of a centaur; but this is a composition of the ideas of things which have existed. We can conceive a sea of milk, because we have seen a sea, and milk; a mountain of gold, because we have seen a mountain, and gold. In the same manner we proceed with what we call the future. The ideas which I have recently enumerated as parts of my belief of to-morrow; the light of day, the throng in the streets, the motion of the tide at London-bridge, are all ideas of the past. The general fact, indeed, is not a matter of dispute. Our idea of the future, and our idea of the past, is the same; with this difference, that it is accompanied with retrospection in the one case, anticipation in the other. What retrospection is, we have already examined. It is Memory. What Anticipation is, we are now to inquire; and to that end it is necessary to recall, distinctly, some important facts which we have already established.
The fundamental law of association is, that when two things have been frequently found together, we never perceive or think of the one without thinking of the other. If the visible idea of a rose occurs to me, the idea of its smell occurs along with it; if the idea of the sound of a drum occurs to me, the visible idea of that instrument occurs along with it.
Of these habitual conjunctions, there is none with which we are more incessantly occupied, from the 363 first moment of our existence to the last, and in which we are more deeply interested, than that of antecedent and consequent. Of course there is none between the ideas of which the association is more intimate and intense.
In fact, our whole lives are but a series of changes; that is, of antecedents and consequents. The conjunction, therefore, is incessant; and, of course, the union of the ideas perfectly inseparable. We can no more have the idea of an event without having the ideas of its antecedent and its consequents, than we can have the idea and not have it at the same time. It is utterly impossible for me to have the visible idea of a rose, without the idea of its having grown from the ground, which is its antecedent; it is utterly impossible for me to have the idea of it without the ideas of its consistence, its smell, its gravity, and so on, which are its consequents.
Of the numerous antecedents and consequents, forming the matter of our experience, some are constant, some are not. Of course the strength of the association follows the frequency. The crow is seen flying as frequently from east to west, as from west to east; from north to south, as from south to north; there is, therefore, no association between the flight of the crow and any particular direction. Not so with the motion of a stone let go in the air: that takes one direction constantly. The order of antecedent and consequent is here invariable. The association of the ideas, therefore, is fixed and inseparable. I can no more have the idea of a stone let go in the air, and not have the idea of its dropping to the 364 ground, than I can have the idea of the stone, and not have it, at the same time.[102]