Chap. IX. ANTIENT METAPHYSICS. 451 



And I hope that following the footfteps of Dr. Clarke, and agree- 

 ing with Dr. Horfely in the capital point, of Body not moving, or 

 continuing to move itfelf, by any Power eflential to its nature, 1 

 have founded Sir Ifaac Newton's Aftronomy upon fuch principles of 

 found philofophy and genuine Theifin, that it will ftand the exa- 

 mination of ages, in defiance of the predidlion of Dr. Swift, ' That 

 * it will not laft, but have the fate of other Syftcms * ;' which, like 

 the comments of opinion, to ufe Cicero's words, Time deftroys, 

 while it confirms the judgments of Nature f« 



But as, after all, I think it is not imlikely that many of my rea- 

 ders may not agree with me in the principles upon which I have put 

 Sir Ifaac Newton's Aftronomy, I think it is not improper, before I 

 conclude this book, fhortly to ftate all the opinions that have been 

 maintained, or can be maintained, concerning the Motion of the 

 Celeftial Bodies : So that, if the reader does not approve of my opi- 

 nion upon the fubjcdt, he may choofe, of all poflible opinions, that 

 which he likes beft. 



And, in the fujl place, it is evident that the Planets muft either 

 move themfelvcs, or they muft be moved by fomething different from 

 themfelves, and which, of neceffity, muft be either Mind or Body, 

 or both Body and Mind ; and the Motion produced in one or other 

 of thefe ways muft be either fimple or combined. Thefe divifions, 

 I think, muft exhauft the whole fubjeft ; fo that I may conclude, 

 in the way that Ariftotle commonly concludes his enumerations, 

 * That, befides thefe, there is nothing.' 



L 1 1 2 If 



* Voyage to Laput-i, clup. 8. 



f Opinionum commenta delet dies, Naturae judicia confirmat. DtNat.Dter. 



