of self-moving matter from all motions, neither is cessation as much as annihilation, for the motion lies in the power of the matter to repeat it, as oft it will, if it be not overpowred, for more parts, or more strength, or more motions may over-power the less; Wherefore forced, or artificial and free Natural motions are different in their effects, although they have but one Cause, which is the self-moving matter, and though Matter is but active and passive, yet there is great Variety, and so great difference in force and liberty, objects and perceptions, sense and reason, and the like. But to conclude, perception is not made by the pressure of objects, no more then hemp is made by the Rope-maker, or metal by the Bell-founder or Ringer, and yet neither the rope nor the metal is without sense and reason, but the natural motions of the metal, and the artificial motions of the Ringer are different; wherefore a natural effect in truth cannot be produced from an artificial cause, neither can the ceasing of particular forced or artificial motions be a proof for the ceasing of general, natural, free motions, as that matter it self should cease to move; for there is no such thing as rest in Nature, but there is an alteration of motions and figures in self-moving matter, which alteration causeth variety as well in opinions, as in every thing else; Wherefore in my opinion, though sense alters, yet it doth not decay, for the rational and sensitive part of matter is as lasting as matter it self, but that which is named decay of sense, is onely the alteration of motions, and not an obscurity of motions, like, as the motions of memory and forgetfulness, and the repetition of the same motions is called remembrance. And thus much of this subject for the present, to which I add no more but rest Madam, _your faithful Friend,_ _and Servant._ [1] _Leviathan, Part._ 1. _c._ 2. VI. _MADAM,_