The Self-moving Parts of Nature seem to be of two sorts, or degrees; one being purer, and so more agil and free than the other; which (in my opinion) are the Rational Parts of Nature. The other sort is not so pure; and are the Architectonical Parts, which are the Labouring Parts, bearing the grosser Materials about them, which are the Inanimate Parts; and this sort (in my opinion) are the Sensitive Parts of Nature; which form, build, or compose themselves with the Inanimate Parts, into all kinds and sorts of Creatures, as Animals, Vegetables, Minerals, Elements, or what Creatures soever there are in Nature: Whereas the Rational are so pure, that they cannot be so strong Labourers, as to move with Burdens of Inanimate Parts, but move freely without Burdens: for, though the Rational and Sensitive, with the Inanimate, move together as one Body; yet the Rational and Sensitive, do not move as one Part, as the sensitive doth with the Inanimate. But, pray mistake me not, when I say, the Inanimate Parts are grosser; as if I meant, they were like some densed Creature; for, those are but Effects, and not Causes: but, I mean gross, dull, heavy Parts, as, that they are not Self-moving; nor do I mean by Purity, Rarity; but Agility: for, Rare or Dense Parts, are Effects, and not Causes: And therefore, if any should ask, Whether the Rational and Sensitive Parts were Rare, or Dense; I answer, They may be Rare or Dense, according as they contract, or dilate their Parts; for there is no such thing as a Single Part in Nature: for Matter, or Body, cannot be so divided, but that it will remain Matter, which is divisible. CHAP. VI. Of Dividing and Uniting of Parts. Though every Self-moving Part, or Corporeal Motion, have free-will to move after what manner they please; yet, by reason there can be no Single Parts, several Parts unite in one Action, and so there must be united Actions: for, though every particular Part may divide from particular Parts; yet those that divide from some, are necessitated to join with other Parts, at the same point of time of division; and at that very same time, is their uniting or joining: so that Division, and Composition or Joining, is as one and the same act. Also, every altered Action, is an altered figurative Place, by reason Matter, Figure, Motion, and Place, is but one thing; and, by reason Nature is a perpetual motion, she must of necessity cause infinite Varieties. CHAP. VII. Of Life and Knowledg. All the Parts of Nature have Life and Knowledg; but, all the Parts have not Active Life, and a perceptive Knowledg, but onely the Rational and Sensitive: And this is to be noted, That the variousness, or variety of Actions, causes varieties of Lives and Knowledges: For, as the Self-moving parts alter, or vary their Actions; so they alter and vary their Lives and Knowledges; but there cannot be an Infinite particular Knowledg, nor an Infinite particular Life; because Matter is divisible and compoundable.