This irregularity of sentiment, which every body feels, which scarce any body is sufficiently aware of, and which no body is willing to acknowledge, I proceed now to explain; and I shall consider, first, the cause which gives occasion to it, or the mechanism by which nature produces it; secondly, the extent of its influence; and, last of all, the end which it answers, or the purpose which the Author of nature seems to have intended by it. CHAP. I. _Of the causes of this influence of fortune._ The causes of pain and pleasure, whatever they are, or however they operate, seem to be the objects, which, in all animals, immediately excite those two passions of gratitude and resentment. They are excited by inanimated, as well as by animated objects. We are angry, for a moment, even at the stone that hurts us. A child beats it, a dog barks at it, a choleric man is apt to curse it. The least reflection, indeed, corrects this sentiment, and we soon become sensible, that what has no feeling is a very improper object of revenge. When the mischief, however, is very great, the object which caused it becomes disagreeable to us ever after, and we take pleasure to burn or destroy it. We should treat, in this manner, the instrument which had accidentally been the cause of the death of a friend, and we should often think ourselves guilty of a sort of inhumanity, if we neglected to vent this absurd sort of vengeance upon it. We conceive, in the same manner, a sort of gratitude for those inanimated objects, which have been the causes of great, or frequent pleasure to us. The sailor, who, as soon as he got ashore, should mend his fire with the plank upon which he had just escaped from a shipwreck, would seem to be guilty of an unnatural action. We should expect that he would rather preserve it with care and affection, as a monument that was, in some measure, dear to him. A man grows fond of a snuff-box, of a pen-knife, of a staff which he has long made use of, and conceives something like a real love and affection for them. If he breaks or loses them, he is vexed out of all proportion to the value of the damage. The house which we have long lived in, the tree, whose verdure and shade we have long enjoyed, are both looked upon with a sort of respect that seems due to such benefactors. The decay of the one, or the ruin of the other, affects us with a kind of melancholy, though we should sustain no loss by it. The Dryads and the Lares of the ancients, a sort of genii of trees and houses, were probably first suggested by this sort of affection, which the authors of those superstitions felt for such objects, and which seemed unreasonable, if there was nothing animated about them.