“We see what importance St. Augustine attaches to memory. It is in his view the faculty which preserves the ideas relating @not@ only to the body, but to the soul, not only to eternal truths, but to the Eternal Being himself——. This memory, which is peculiar to man, and which animals do not possess—this memory, which in a mysterious manner contains in it intelligible realities, is, according to the Bishop of Hippo, one of the three great faculties of man, and the origin of the other two. It is from it that intelligence arises, and the will proceeds from the one to the other and unites them. Thus, if it is allowed to compare things human with things divine, we have in us an image of the august Trinity. Memory, in which is the matter of knowledge, and which is as the place of intelligible things, offers some resemblance to the Father; the intellect, which is derived ¬from¬ and formed from it, is not without analogy to the Son; and love or will, which unites the intelligible (or memory) to the intellect has a certain resemblance to the Holy Spirit.”[41] The phenomena of memory were also important with Augustine as weapons against materialism. By memory the soul knows objects of sense when it no longer perceives them, and, moreover, combines the heterogeneous in ways inexplicable by means of a phys¬ch¬ical substance. And again the soul can form abstract conceptions of space and mathematical truths. The well-known conditions of a good memory, such as acuteness of sensation, order, and repetition, Augustine notices only incidentally. More attention is given to the relation of the will to memory and to the association of ideas. Whether we remember or not depends upon the will. By an act of will we avert the memory from sense-perceptions, as, for example, when we hear a speaker and do not notice what he says, or read a page and do not know what we have read, or walk with our attention upon something else. In all these cases we perceive, but do not remember our perceptions. So, too, recollection depends upon the will: “As the will applies the @sense to the@ body (or external object), so it applies the memory to the sense, and the eye of the mind of the thinker to the memory.”[42] This power of the will over memory is, however, limited by the association of ideas. In order to recall anything by a voluntary effort we must remember the general notion of the thing or some associated idea. “For example, if I wish to remember what I supped on yesterday, either I have already remembered that I did sup, or if not yet this, at least, I have remembered something about that time itself, if nothing else; at all events, I have remembered yesterday and that part of yesterday in which people usually sup, and what supping is.”[43] In another place he says that, of a series of ideas the lost part is recovered “by the part whereof we had hold.”