make Perception, so they do neither make Understanding, but it is the rational matter that doth it, for Understanding may be without exterior objects and sensitive organs; And this in short is the opinion of Madam, _Your faithful Friend_ _and Servant._ [1] _Part._ 1. _ch._ 1. V. _Madam_, Your Authours opinion is,[1] that _when a thing lies still, unless somewhat else stir it, it will lie still for ever; but when a thing is in motion, it will eternally be in motion, unless somewhat else stay it; the reason is,_ saith he, _because nothing can change it self_; To tell you truly, _Madam_, I am not of his opinion, for if Matter moveth it self, as certainly it doth, then the least part of Matter, were it so small as to seem Individable, will move it self; 'Tis true, it could not desist from motion, as being its nature to move, and no thing can change its Nature; for God himself, who hath more power then self-moving Matter, cannot change himself from being God; but that Motion should proceed from another exterior Body, joyning with, or touching that body which it moves, is in my opinion not probable; for though Nature is all Corporeal, and her actions are Corporeal Motions, yet that doth not prove, that the Motion of particular Creatures or Parts is caused by the joining, touching or pressing of parts upon parts; for it is not the several parts that make motion, but motion makes them; and yet Motion is not the cause of Matter, but Matter is the cause of Motion, for Matter might subsist without Motion, but not Motion without Matter, onely there could be no perception without Motion, nor no Variety, if Matter were not self-moving; but Matter, if it were all Inanimate and void of Motion, would lie as a dull, dead and senseless heap; But that all Motion comes by joining or pressing of other parts, I deny, for if sensitive and rational perceptions, which are sensitive and rational motions, in the body, and in the mind, were made by the pressure of outward objects, pressing the sensitive organs, and so the brain or interior parts of the Body, they would cause such dents and holes therein, as to make them sore and patched in a short time; Besides, what was represented in this manner, would always remain, or at least not so soon be dissolved, and then those pressures would make a strange and horrid confusion of Figures, for not any figure would be distinct; Wherefore my opinion is, that the sensitive and rational Matter doth make or pattern out the figures of several Objects, and doth dissolve them in a moment of time; as for example, when the eye seeth the object first of a Man, then of a Horse, then of another Creature, the sensitive motions in the eye move first into the figure of the Man, then straight into the figure of the Horse, so that the Mans figure is dissolved and altered into the figure of the Horse, and so forth; but if the eye sees many figures at once, then so many several figures are made by the sensitive Corporeal