1. And first to begin at the lowest step, Body is a thing that affecteth the senses most plainly and feelingly; for though many bodies are so pure, as the air, æther, steams of the Loadstone, and many other steams of bodies, that they escape the sight of our eyes, yet are they either manifest to our feeling, or otherwise made manifest by some sensible effect, operation, or the like; yet for all this, the intrinsick nature of body as such is utterly unknown unto us, for when we speak of the extension of body, as its Characteristical property, we do but conceive of its superficial dimensions, its internal nature _quatenus Corpus_, being utterly unknown unto us; it being a certain truth, that _Quidditates rerum, non sunt cognoscibiles_; and as D^r _Moore_ granteth, the naked essence or substance of a thing is utterly unconceiveable to any of our faculties. From whence we argue, _à minori ad majus_, that if the substance of a body, whose affections and modifications do fully incur into, and work upon our senses, be utterly unconceiveable to any of our senses, much more of necessity must the substance of a Created spirit, conceived as immaterial and incorporeal, be utterly unconceiveable to any of our faculties, because it hath no effects, operations, or modifications that can or do operate upon our senses. [Sidenote: _Argum. 2._] 2. And as we know not the intrinsick nature of body, so also we are ignorant of the highest degree of the purity and spiritualness of bodies, nor do we know where they end, and therefore cannot tell where to fix the beginning of a meer spiritual and immaterial being. For there are of Created bodies in the Universe, so great a diversity, and of so many sorts and degrees of purity and fineness, one exceeding another, that we cannot assign which of them cometh nearest to incorporeity, or the nature of spirit. And many of these being compared with other more gross and palpable bodies, may be and are called and accounted spirits, though notwithstanding they be all Corporeal, and but under a gradual difference. So the vital part in the bodies of men are by Physicians called Spirits in relation to the bones, ligaments, musculous flesh and the like; nay even in respect of the blood, lymphatick humor, lacteal juyce, or the _succus nutritius nervosus_, and yet still are contained within the limits of body, and are as really Corporeal as any of the rest, and so are the air and æther. And those visible species of other bodies that are carried in the air and represented unto our Eyes, by which we distinguish the shape, colour, site and similitude of one body from another, though by the Schools passed over with that sleight title of qualities, as though they were either simply nothing, or incorporeal things, are notwithstanding really Corporeal, else they could not incur into, nor affect the visive sensories: And these do in the air intersect and pass through one another (as may be optically demonstrated) without