[2] In his Elements of Philosophy, part. 1. c. 1. art. 1.
[XII.]
Madam,
Two sorts of motions, I find your Author[1] doth attribute to Animals, viz. Vital and Animal, the Vital motions, says he, are begun in Generation, and continued without Interruption through their whole life, and those are the Course of the Blood, the Pulse, the Breathing, Conviction, Nutrition, Excretion, &c. to which motions there needs no help of Imaginations; But the animal Motions, otherwise called voluntary Motions, are to go, to speak, to move any of our limbs, in such manner as is first fancied in our minds: And because going, speaking, and the like voluntary motions, depend always upon a precedent thought of whither, which way, and what, it is evident, that the Imagination is the first Internal beginning of all voluntary Motion. Thus far your Author. Whereof in short I give you my opinion, first concerning Vital Motions, that it appears improbable if not impossible to me, that Generation should be the cause and beginning of Life, because Life must of necessity be the cause of Generation, life being the Generator of all things, for without life motion could not be, and without motion not any thing could be begun, increased, perfected, or dissolved. Next, that Imagination is not necessary to Vital Motions, it is probable it may not, but yet there is required Knowledg, which I name Reason; for if there were not Knowledg in all Generations or Productions, there could not any distinct Creature be made or produced, for then all Generations would be confusedly mixt, neither would there be any distinct kinds or sorts of Creatures, nor no different Faculties, Proprieties, and the like. Thirdly, concerning Animal Motions, which your Author names Voluntary Motions, as to go, to speak, to move any of our limbs, in such manner as is first fancied in our minds, and that they depend upon a precedent thought of whither, which way, and what, and that Imagination is the first Internal beginning of them; I think, by your Authors leave, it doth imply a contradiction, to call them Voluntary Motions, and yet to say they are caused and depend upon our Imagination; for if the Imagination draws them this way, or that way, how can they be voluntary motions, being in a manner forced and necessitated to move according to Fancy or Imagination? But when he goes on in the same place and treats of Endeavour, Appetite, Desire, Hunger, Thirst, Aversion, Love, Hate, and the like, he derives one from the other, and treats well as a Moral Philosopher; but whether it be according to the truth or probability of Natural Philosophy, I will leave to others to judge, for in my opinion Passions and Appetites are very different, Appetites being made by the motions of the sensitive Life, and Passions, as also Imagination, Memory, &c. by the motions of the rational Life, which is the cause that Appetites belong more to the actions of the Body then the Mind: 'Tis true, the Sensitive and Rational self-moving matter doth so much resemble each other in their actions, as it is difficult to distinguish them. But having treated hereof at large in my other Philosophical Work, to cut off repetitions, I will refer you to that, and desire you to compare our opinions together: But certainly there is so much variety in one and the same sort of Passions, and so of Appetites, as it cannot be easily express'd. To conclude, I do not perceive that your Author tells or expresses what the cause is of such or such actions, onely he mentions their dependance, which is, as if a man should converse with a Nobleman's Friend or Servant, and not know the Lord himself. But leaving him for this time, it is sufficient to me, that I know your Ladyship, and your Ladyship knows me, that I am,
Madam,
Your faithful Friend, and humble Servant.
[1] Leviathan, part. 1. c. 6.