It is proper to begin with the elements which are universally acknowledged. Among them, it is certain, that IDEAS are the fundamental part. Nothing is remembered but through its IDEA. The memory, however, of a thing, and the idea of it, are not the same. The idea may be without the memory; but the memory cannot be without the idea. The idea of an elephant may occur to me, without the thought of its having been an object of my senses. But I cannot have the thought of its having been an object of my senses, without having the idea of the animal at the {321} same time. The consciousness, therefore, which I call memory, is an idea, but not an idea alone; it is an idea and something more. So far is our inquiry narrowed. What is that which, combined with an idea, constitutes memory? That memory may be, the idea must be. In what manner is the idea produced? We have already seen in what manner an idea is called into existence by association. It is easy to prove that the idea which forms part of memory is called up in the same way, and no other. If I think of any case of memory, I shall always find that the idea, or the sensation which preceded the memory, was one of those which are calculated, according to the laws of association, to call up the idea involved in that case of memory; and that it was by the preceding idea, or sensation, that the idea of memory was in reality brought into the mind. I have not seen a person with whom I was formerly intimate for a number of years; nor have I, during all that interval, had occasion to think of him. Some object which had been frequently presented to my senses along with him, or the idea of something with which I have strongly associated the idea of him, occurs to me; instantly the memory of him exists. The friend with whom I had often seen him in company, accidentally meets me; a letter of his which had been long unobserved, falls under my eye; or an observation which he was fond of producing, is repeated in my hearing; these are circumstances all associated with the idea of the individual in question; the idea of him is excited by them, and with the mere idea of the {322} man, all the other circumstances which constitute memory. The necessary dependence of memory upon association, may be proved still more rigidly in this way. It has been already observed, that we cannot call up any idea by willing it. When we are said to will, there must be in the mind, the idea of what is willed. "Will, without an idea," are incongruous terms; as if one should say, "I can will, and will nothing." But if the idea of the thing willed, must be in the mind, as a condition of willing, to will to have an idea in the mind, is to will to have that in it, which, by the supposition, is in it already.