to stand Still; and to seem to our senses sometimes Hot, sometimes Cold, sometimes of one Colour, Smel, Tast, or Sound, somtimes of another. And this diversity of Seeming, (produced by the diversity of the operation of bodies, on the organs of our sense) we attribute to alterations of the Bodies that operate, & call them Accidents of those Bodies. And according to this acceptation of the word, Substance and Body, signifie the same thing; and therefore Substance Incorporeall are words, which when they are joined together, destroy one another, as if a man should say, an Incorporeall Body.
But in the sense of common people, not all the Universe is called Body, but only such parts thereof as they can discern by the sense of Feeling, to resist their force, or by the sense of their Eyes, to hinder them from a farther prospect. Therefore in the common language of men, Aire, and Aeriall Substances, use not to be taken for Bodies, but (as often as men are sensible of their effects) are called Wind, or Breath, or (because the some are called in the Latine Spiritus) Spirits; as when they call that aeriall substance, which in the body of any living creature, gives it life and motion, Vitall and Animall Spirits. But for those Idols of the brain, which represent Bodies to us, where they are not, as in a Looking-glasse, in a Dream, or to a Distempered brain waking, they are (as the Apostle saith generally of all Idols) nothing; Nothing at all, I say, there where they seem to bee; and in the brain it self, nothing but tumult, proceeding either from the action of the objects, or from the disorderly agitation of the Organs of our Sense. And men, that are otherwise imployed, then to search into their causes, know not of themselves, what to call them; and may therefore easily be perswaded, by those whose knowledge they much reverence, some to call them Bodies, and think them made of aire compacted by a power supernaturall, because the sight judges them corporeall; and some to call them Spirits, because the sense of Touch discerneth nothing in the place where they appear, to resist their fingers: So that the proper signification of Spirit in common speech, is either a subtile, fluid, and invisible Body, or a Ghost, or other Idol or Phantasme