XIII. The An∣swer. I Answer, That there is no Necessity that the Mind should be first United to the Body, before it operate there, in regard its Existence precedes not Action in Time: So that it does not absolutely require to be joyned to the Body, before such time as it draws forth its Operations. Nay, if the Matter were well Examin'd, when as Spirit is confin'd to no Space, and may only be in a place by its Operations: It cannot therefore be said, to be in the Body, but because it exercises there its Operations or Cogitations dependently on the Body. Which mutual Correspondence constitutes the Reason of the Union, which is between the Mind and Body.
XIV. When the Union be∣tween Mind and Body be∣gins. But if it be ask'd, How comes about this Conjunction of Soul and Body, and when doth it begin?
I Answer again, It is most Consentaneous to Reason, to believe that this Union begins at that very moment in which the Body gives occasion to the Mind, to draw forth some Cogitation, and Contrarily the Soul to the Body, to stir up some motion. For as this Conjunction is plac'd in a mutual Dependency, which is between both, in respect of certain Actions and Passions, it cannot begin sooner: So that it is most probable, that such a Union begins, as soon as the Heart, Brain, Nerves, Muscles, &c. are sufficiently fram'd to bring it about, that the Action of the Objects may be transmitted as far as the Glandula and the Animal Spirits be convey'd into the Muscles. On the contrary, this Union ceaseth, whenever it hap∣pens that the said Commerce cannot be continued, or when any part of the Body is so defective, that the Heart is no longer able to transfuse the Spirits to the Brain; nor the Brain into its Muscles, to agitate some, and conserve others in their proper state: So that the said Confederacy is never broken on the part of the Mind, but of the Body.
XV. This Union is Essen∣tial to Man. From these things we deduce, that the Con∣junction of Soul and Body, though it be call'd an Accident of either part, so far as it may be pre∣sent or absent, without the destruction of either part, is nevertheless so proper to both Parts of Man together, that it may and ought to be allow'd to be Essential to him: For Essence, as it is deriv'd from Esse, to be, is so called, because so long as it is something, it must of necessity be. So that so long as Man is, it follows, that the foresaid Efficacy of Mind upon Body, and of Body upon Mind, must needs be.
XVI. Why GOD may not be said to be joyn'd to his Crea∣tures, or an Angel to an assu∣med Body. But it is also easie to Understand, why GOD, tho' he is present to all Created things, as who Conserves the same by a Continued Creation; yet nevertheless is not said to be conjoyned to them, in regard they cannot act upon GOD, by exciting in him those Cogitations which he had not before. So also an Angel, who according to the Vul∣gar Opinion, is present personally an assumed Body, cannot be said to be joyned to the said Body. For tho' an Angel may act upon such a Body, yet that Body cannot Re-act upon the Angel; So as that when the said Body, for Examples sake, is hurt, the Angel should feel pain, as we find by Experience in our selves.
XVII. Conditions of the Union of Body and Soul. But as there is no Society, which is not founded upon some Conditions, which are Reciprocal be∣tween one and the other party, united or associated
together: GOD, in the formation of Man, united Body and Spirit upon these Conditions.
XVIII. The First Condition▪ The First is, That as long as the Soul shall remain United to the Body, there will be an Idea of Extension, that is to say, of Body, consider'd in it self; and that it shall have this Idea from the motion of the Brain, excited by the general Course of the Animal Spirits; according to which con∣dition, the Soul hath always present the Idea of Extension, as Experience teacheth us.
XIX. The Second, The Second is, That the whole motion of the Brain, which is excited by the Nerves, will pro∣duce within the Soul a certain Sensation, which will always accompany this motion, and the Soul not be able to separate it. By means of this Con∣dition, we fee, for Example, the Light, when the Sun moves the Optick Nerves: We hear Noise, when resounding Bodies shake the Auditive Nerves.
XX. The Third. The Third, That the Spirit, so long as it re∣mains United to the Body, will have the Idea of some particular Body, from the motion which this Body shall excite in the Brain, by the means of the Organs of Sense. By this Condition, the Soul hath the Idea of all Bodies, which smite the Senses.
XXI. The Fourth. The Fourth, That the whole motion of the Brain, which shall be excited by the determinate Course of the Animal Spirits, resembling another motion, caused by the Nerves, will produce in the Soul the Idea of some particular Body, which the Soul hath already perceiv'd. By this Condition it is, that there are represented to us things absent, which we have formerly seen.
XXII. The Fifth. The Fifth is, That by the Sense of Touching we feel pleasure or pain, according as the movents, which cause these Sensations, shall be conformable or in opposition to the Natural Constitution of the Body. By this Condition, the motion of a Feather drawn over the Hand, as it were for Titillation, will cause a Sentiment of pain in Sick People, in regard the said motion is not agreeable to the present state of the Body. On the contrary, it excites a Sentiment of pleasure to those that are in health, because in that Estate it is conformable to the pre∣sent Constitution of the Body.
XXIII. The Sixth. The Sixth is, That when we have received the Idea of an Object, it will be attended by an In∣clination of the Soul, which will carry it either to fly or to pursue the said Object, according as it shall appear good or bad. By this Condition it is that we are sensible of Love, Hatred, and gene∣rally all Passions that attend the Soul.
XXIV. The Se∣venth. The Seventh is, That all the Thoughts of the Soul, which regard the preservation of the Body, as they create Sentiments and Passions, must be accompanied with that motion of the Animal Spirits, which shall be most proper for the Exe∣cution of the Desires of the Soul. And it is upon this Condition that Fear, for Example, is accompanied with a Course of Animal Spirits, which induceth us to shun what we fear; and that on the contrary, Desire is accompanied with a Course of Spirits, which carries us to the pursuit of that which we desire.
XXV. The Eighth. The Eighth is, That the Spirit, inasmuch as it is united with the Body, never Thinks, but by the motions of the Body, to which it is united. And it is by this Condition, that all the Idea's which we