§. 1. TO prove that Spirit and Body differ not essentially, but gradually, I shall deduce my Fourth Argument from the intiment Band or Union, which intercedes between Bodies and Spirits, by means whereof the Spirits have Dominion over the Bodies with which they are united, that they move them from one place to another, and use them as Instruments in their various Operations. For if Spirit and Body are so contrary one to another, so that a Spirit is only Life, or a living and sensible Substance, but a Body a certain Mass merely dead; a Spirit penetrable and indiscerpible, but a Body impenetrable and discerpible, which are all contrary Attributes: What (I pray you) is that which doth so join or unite them together? Or, what are those Links or Chains, whereby they have so firm a connexion, and that for so long a space of Time? Moreover also, when the Spirit or Soul is separated from the Body, so that it hath no longer Dominion or Power over it to move it as it had before, What is the cause of this separation? If it be said, that the vital agreement, the Soul hath to the Body, is the cause of the said Union, and that the Body being corrupted that vital Agreement ceaseth. I Answer, We must first enquire, in what this vital Agreement doth consist; for if they cannot tell us wherein it doth consist, they only trisle with empty Words, which give a sound but want a signification: For certainly in that sence which they take Body and Spirit in, there is no Agreement at all between them; for a Body is always a dead Thing, void of Life and sense, no less when the Spirit is in it, than when it is gone out of it: Hence there is no Agreement at all between them; and if there is any Agreement, that certainly will remain the same, both when the Body is found, and when it is corrupted. If they deny this, because a Spirit requires an organized Body, by means whereof it performs its vital Acts of the external Senses; moves and transports the Body from place to place; which Organical Action ceases when the Body is corrupted. Certainly by this the difficulty is never the better solved. For why doth the Spirit require such an organized Body? ex. gr. Why doth it require a Corporeal Eye so wonderfully formed and organized, that I can see by it? Why doth it need a Corporeal Light, to see Corporeal Objects? Or, why is it requisite, that the Image of the Object should be sent to it, through the Eye, that it may see it? If the same were entirely nothing but a Spirit, and no way Corporeal, Why doth it need so many several Corporeal Organs, so far different from the Nature of it? Furthermore, how can a Spirit move its Body, or any of its Members, if a Spirit (as they affirm) is of such a Nature, that no part of its Body can in the least resist it, even as one Body is wont to resist another, when 'tis moved by it, by reason of its Impenetrability? For if a Spirit could so easily penetrate all Bodies, Wherefore doth it not leave the Body behind it, when it is moved from place to place, seeing it can so easily pass out without the least resistance? For certainly this is the cause of all Motions which we see in the World, where one Thing moves another, viz. because both are impenetrable in the sence aforesaid: For were it not for this Impenetrability one Creature could not move another, because this would not oppose that, nor at all resist it; an Example whereof we have in the Sails of a Ship; by which the Wind drives the Ship, and that so much the more vehemently, by how much the fewer holes, vents, and passages, the same finds in the Sails against which it drives: When on the contrary, if instead of Sails Nets were expanded, through which the Wind would have a freer passage; certainly by these the Ship would be but little moved, although it blew with great violence: Hence we see how this Impenetrability causes resistance, and this makes Motion. But if there were no Impenetrability, as in the case of Body and Spirit, then there could be no resistance, and by consequence the Spirit could make no motion in the Body.