Memory can be likened to a photographic plate; the impressions it takes remain there, and when a person wishes to recollect something this faculty helps him. It is within his reach. As soon as he wants to recall an experience he puts his hand, so to speak, on that particular plate which has received the impression of a certain experience. No experience received from sight, or smell, or hearing, or touch, or taste is lost. When people say, "My memory is not good; I cannot remember things; I am absentminded", the reason is that they have lost control over this faculty; but the impression is there all the same. Very often a person says, "I know it, but I cannot recall it to my memory." In other words, in his mind he knows it, but in his brain it is not yet clear. For instance, when a person cannot remember the name or the face of someone he says, "I think I know it but I cannot find it for the moment." That means that his mind knows it, that it is there, but that he cannot make it clear in his brain.