must include every particular existence.[278] In it, absolute potency and absolute actuality, matter and form, do not differ at all; it is the extreme of purity, simplicity, individuality, and unity, because it is absolutely all. It is individual in the highest sense. Being both matter and form, it is neither: as matter, it has all dimensions and none; as form, it has all formal existence or qualities and none. The corporeal matter is _contracted_ to this or that dimension, whereas spiritual matter is free (_absoluta_) of dimensions, therefore is both above all, and comprising all. Thus matter in itself, being without dimensions, is indivisible: it acquires dimensions according to the nature of the form it receives: the dimensions under the human form differ from those under the horse form, and from those under the olive or the myrtle form. But before it can be under any of these forms, it must have _in faculty_ all their dimensions, as it has the possibility or potency of receiving all the forms. In itself it includes rather than excludes all dimensions, because it does not receive them as from without, but sends them, brings them forth, from itself, as from the womb."[279] In other words, _Nature_, under one aspect, is a spiritual unity, in which are comprised all possible differences, or all separate existences: under another it is these many existences themselves, in each of which, in succession, all differences are "realised," all modes come into being: and finally, under another aspect, it is the force which brings forth the separate forms or existences out of the formless, indeterminate, undifferentiated unity of being, or God. The two kinds of matter, or potentiality, the lower and the higher, are thus essentially one; so we reach the notion, not indeed of "the highest and best principle," as Bruno is again careful to remind us, but of the soul of the world, as reality of all, and potency of all, and all in all. Thus in the end, although individuals are innumerable, all things are one; and the knowledge of this unity is the goal and limit of all philosophy of nature. [Sidenote: The unity of spirit and body.] [Sidenote: Coincidence of all things in the One.]