Chapter XVI: Madam,

_Sensation in corporeal motion is first, and Perception follows_, sayes your _Author_:[1] to which opinion I give no assent, but do believe that Perception and Sensation are done both at one and the same time, as being one and the same thing without division, either in reason or sense, and are performed without any knocks, or jolts, or hitting against. But let me tell you, _Madam_, there arises a great mistake by many, from not distinguishing well, sensitive Motion, and rational Motion; for though all motions are in one onely matter, yet that matter doth not move always in the same manner, for then there could be no variety in Nature; and truly, if man, who is but a part of Nature, may move diversly, and put himself into numerous postures; Why may not Nature? But concerning Motions, and their variety, to avoid tedious repetitions, I must still referr you to my Book of _Philosophical Opinions_; I'le add onely this, that it is well to be observed, That all Motions are not Impressions, neither do all Impressions make such dents, as to disturb the adjoyning Parts: Wherefore those, in my opinion, understand _Nature_ best, which say, that Sensation and Perception are really one and the same; but they are out, that say, there can be no communication at a distance, unless by pressing and crowding; for the patterning of an outward object, may be done without any inforcement or disturbance, jogging or crowding, as I have declared heretofore; for the sensitive and rational motions in the sensitive and rational parts of matter in one creature, observing the exterior motions in outward objects, move accordingly, either regularly or irregularly in patterns; and if they have no exterior objects, as in dreams, they work by rote. And so to conclude, I am absolutely of their opinion, who believe, that there is nothing existent in Nature, but what is purely Corporeal, for this seems most probable in sense and reason to me,

Madam,

_Your Faithful Friend_

_and Servant._

[1] _In the Pref. of the Imm. of the Soul._