"But we all naturally conceive that those things have not only an eternal, but also a necessary existence, so that they could not ever but be, such and so many as they are, and can never possibly perish or cease to be, but are absolutely undestroyable. "Which is a thing frequently acknowledged in the writings of both those famous philosophers, Plato and Aristotle. The former of them calling those things, 'things that were never made, but always are,' and 'things that were never made, nor can be destroyed.' 'Things ingenerable and unperishable;' _Quæ_ Plato _negat gigni sed semper esse_ (as Tully expresseth it) _et ratione et intelligentia contineri_. And Philo the Platonical Jew, calls the [Greek: ta\ Noêta\], which are the same things we speak of, [Greek: a)nagkaio/tatai ou)si/ai], the most necessary essences, that is, such things as could not but be, and cannot possibly not be. And Aristotle himself calls the _rationes_ of things in his metaphysics, not only [Greek: chôrista\] and [Greek: a)ki/nêta], things separate from matter and immutable, but also [Greek: a)ï/dia], or eternal; and in his ethics likewise, he calls geometrical truths [Greek: a)ï/dia], eternal things, 1. 3, c. 5; 'where he makes the geometrical truth concerning the incommensurability betwixt the {258} diameter and the side of a square, to be an eternal thing.' Elsewhere he tells us, that 'Science, properly so called, is not of things corruptible and contingent,' but of things necessary, incorruptible and eternal. Which immutable and eternal objects of science, in the place before quoted, he described thus: 'Such a kind of entity of things has neither motion nor generation, nor corruption,' that is, such things as were never made, and can never be destroyed. To which, he saith, the mind is necessarily determined. For science or knowledge has nothing either of fiction or of arbitrariness in it, but is 'the comprehension of that which immutably is.'