The succession of events is not the same thing as the succession of cause and effect. By assigning a reason for a thing, I mean then being able to refer it to a general rule or principle collected from and proved by an infinite number of collateral instances, and confirming the particular fact or instance to which it is applied. It is drawing together the different ramifications of our experience, and winding them round a particular bundle of things, and tying them fast together. Thus suppose we have never seen a carnation of the size of a cabbage: does it follow that we never shall, or that there can be no such thing? We might say, I know no _reason_ why a flower of a certain shape, colour, &c. should not reach a certain size, but that it has never been so within my knowledge. This might however be owing to the soil, culture, or a thousand circumstances, which are not invariable.—But the moment the reason is given (supposing it to be a good one) namely, the connection between the contexture and weight, (though this reason is also derived indirectly from the general fund of our experience) there is an end at once of the question. To suppose a flower to grow to a greater height than it could support from the slenderness of the stalk would be to suppose what never happened not only with respect to that particular flower, the carnation, but with respect to any other flower, or plant, or animal, or any other body whatever. We know that climate has such an effect that what are plants with us, in the tropical climates become large trees: but the necessary proportion between the size or weight of the plant, and the strength of the stalk that is to support it, is what no change of soil or climate can supersede, unless we could supersede the law of gravitation itself. The mere experimental or historical proof is here then buttressed up by the general rule, or reason of the thing.—I have always seen a stone fall to the ground; I remember a house always to have stood where it does; a hill has never stirred from the place where I first saw it. Is the inference to be drawn from these different cases equally certain? Am I to conclude that the house will last as long as the mountain, because I have the same positive evidence of their permanence? No: because though I have never seen any alteration in that particular house, I have seen other houses pulled down and built up; and besides, from the size of the objects, the shape and nature of the materials, I know that one of them may be very easily destroyed, whereas nothing but some great convulsion in nature is ever likely to destroy the other or remove it from its place. Our particular experience is only to be depended on, as it is explained and confirmed by analogy to other cases, viz. by a number of other facts of the same kind, or by general observation. Secondly, the aggregate of our experience with respect to any given class of events is constantly over-ruled by the _reason of the case_, viz. by our knowledge of cause and effect, by the intelligible, explicit connections of things, and by considering whether the principles concerned in the production of a series of events, (forming a body of facts, or the concrete mass of our experience) are resolvable into a simple law of nature operating universally, unchangeably, without ever being suspended for a moment, (as for instance, the law of gravitation which holds equally of all bodies in all cases, and can never be separated from our reasonings upon them) or whether the event has been owing to a combination of mixed causes, which do not always act alike and with equal force, or the effect of which depends upon circumstances, which we know may be altered, (as in the case of soils, climates, methods of culture,[26] &c. to return to the former example). Suppose a rock to have stood for ages on the summit of a mountain. Am I sure that it will stand there always? Yes, if nothing happens to prevent it. But can I be sure that nothing will ever remove it, because nothing has ever done so hitherto? On the contrary, I know that if a man points a cannon against it, it will be shattered to pieces in an instant, though it has stood there for ages, and though there is not at present the least appearance of a change in it. Here then my experience is of no avail against my reason. In one sense of the word, it is all thrown away, and goes for nothing. To judge rationally, I must take other circumstances into the account, the effects of gunpowder, &c. The resistance made by the rock will depend upon its hardness, not upon the length of time it had stood there.