Chap.VII. ANTIENT METAPHYSICS. 45 



Power, therefore, ene^gy, or adlivity, (for by all thefe words it may 

 be exprefled), is an eflential quality of that fubftance I call Mind. 

 And as this power or energy is mod obvious to the fenfes in mo^ 

 iion, I have defined Mind by the power of tnoviiig, and alfo becaufe 

 every thing in the material world is in Motion, by which the whole 

 frame of Nature is fuftained and preferved. There is, likewife, ano- 

 ther reafon, viz. That, without this power of Mind, Body could not 

 cxift, though Matter might, according to the dilHndion made by the 

 antients betwixt Body and Matter ; for it is this moving power of 

 Mind that makes the particles of Matter run together, cohere, and 

 form Boxly *. 



The quefllon, then, is, What the nature of the fubftance is of 

 which this power is a quality I And I fay the Subftance muft be 

 immaterial ; for, as the power is not a quality of Matter, and 

 yet is a quality, it muft be a quality of fomething which is 

 not Matter, or, in other words, immaterial ; for immaterial is 

 nothing but the negation of Matter. And this I think is evi- 

 den'ce fufEcient for the immateriality of Mind. But, whoever 

 defires more, may confult the fourteenth chapter of the fecond 

 book of Volume Firft, where he will find it proved, a priori^ from 

 the nature of Motion, of Body, and of Mind ; and in the following 

 chapter there is a proof of it likewife a pojleriori ; both which, joined 

 together, make, if I am not much deceived, the cleareft proof of the 

 immateriality of Mind that has hitherto been produced : And it is a 

 proof which goes to every principle of motion in Body ; and for 

 that reafon I have called the motive principle, even in Bodies unor- 

 ganized. Mind, becaufe every thing immaterial, or, in other words, 

 what is not Body, muft of neceftity be Mind. Ariftotle, as I have 

 obferved, fays, that the motive principle in thofe Bodies is like 



Mind ; 



* It is well obferved by Proclus, tbat whatever keeps together aHs, and whatever 

 a£ts is incoiporea), or Mind. I have quoted the paflage, in a note, upon p. 86. cf 

 the Firft Volume, which fee. See alfo p. 177. 



