Chapter V: Madam,

The _Author_, mentioned in my former Letter, says, _That Quietness is the degree of Infinite slowness, and that a moveable body passing from quietness, passes through all the degrees of slowness without staying in any._ But I cannot conceive that all the Parts of Matter should be necessitated to move by degrees; for though there be degrees in Nature, yet Nature doth not in all her actions move by degrees. You may say, for example, from one to twenty, there are eighteen degrees between One, and Twenty; and all these degrees are included in the last degree, which is twenty. I answer; That may be: but yet there is no progress made through all those degrees; for when a body doth move strong at one time, and the next time after moves weak; I cannot conceive how any degrees should really be made between. You may say, by Imagination. But this Imagination of degrees, is like the conception of Space and Place, when as yet there is no such thing as Place or Space by it self; for all is but one body, and Motion is the action of this same body, which is corporeal Nature; and because a particular body can and doth move after various manners, according to the change of its corporeal motion, this variety of motions man call's Place, Space, Time, Degrees, &c. considering them by themselves, and giving them peculiar names, as if they could be parted from body, or at least be conceived without body; for the Conception or Imagination it self is corporeal, and so are they nothing else but corporeal motions. But it seems as if this same _Author_ conceived also motion to be a thing by it self, and that motion begets motion, when he says, That a body by moving grows stronger in motion by degrees, when as yet the strength was in the matter of the body eternally; for Nature was always a grave Matron, never a sucking Infant: and though parts by dissolving and composing may lose and get acquaintance of each other, yet no part can be otherwise in its nature, then ever it was; Wherefore change of corporeal motions is not losing nor getting strength or swiftness; for Nature doth not lose force, although she doth not use force in all her various actions; neither can any natural body get more strength than by nature it hath, although it may get the assistance of other bodies joyned to it. But swiftness and slowness are according to the several figurative actions of self-moving matter; which several actions or motions of Nature, and their alterations, cannot be found out by any particular Creature: as for example, the motions of Lead, and the motions of Wood, unless Man knew their several causes; for Wood, in some cases, may move slower then Lead; and Lead, in other cases, slower then Wood. Again: the same _Author_ says, _That an heavy moveable body descending, gets force enough to bring it back again to as much height._ But I think, it might as well be said, That a Man walking a mile, gets as much strength as to walk back that mile; when 'tis likely, that having walked ten miles, he may not have so much strength as to walk back again one mile; neither is he necessitated to walk back, except some other more powerful body do force him back: for though Nature is self-moving, yet every part has not an absolute power, for many parts may over-power fewer; also several corporeal motions may cross and oppose as well as assist each other; for if there were not opposition, as well as agreement and assistance amongst Nature's parts, there would not be such variety in Nature as there is. Moreover, he makes mention of a _Line, with a weight hung to its end, which being removed from the perpendicular, presently falls to the same again._ To which, I answer: That it is the appetite and desire of the Line, not to move by constraint, or any forced exterior motion; but that which forces the Line to move from the Perpendicular, doth not give it motion, but is onely an occasion that it moves in such a way; neither doth the line get that motion from any other exterior body, but it is the lines own motion; for if the motion of the hand, or any other exterior body, should give the line that motion, I pray, from which doth it receive the motion to tend to its former state? Wherefore, when the Line moves backwards or forwards, it is not, that the Line gets what it had not before, that is, a new corporeal motion, but it uses its own motion; onely, as I said, that exterior body is the occasion that it moves after such a manner or way, and therefore this motion of the line, although it is the lines own motion, yet in respect of the exterior body that causes it to move that way, it may be called a forced, or rather an occasioned motion. And thus no body can get motion from another body, except it get matter too; for all that motion that a body has, proceeds from the self-moving part of matter, and motion and matter are but one thing; neither is there any inanimate part of matter in Nature, which is not co-mixed with the animate, and consequently, there is no part which is not moving, or moved; the Animate part of matter is the onely self-moving part, and the Inanimate the moved: not that the animate matter doth give away its own motion to the inanimate, and that the inanimate becomes self-moving; but the animate, by reason of the close conjunction and commixture, works together with the inanimate, or causes the inanimate to work with it; and thus the inanimate remains as simple in its own nature, as the animate doth in its nature, although they are mixt; for those mixtures do not alter the simplicity of each others Nature. But having discoursed of this subject in my former Letters, I take my leave, and rest,

Madam,

_Your faithful Friend_

_and Servant._