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THE FOVRTH PART. (Book 4)
CHAP. I.
Of METAPHYSICK.
THE fourth and last part of Philosophy, which treateth of Ens in generall, is by Aristotle termed sometimes, First, Philo∣sophy, sometimes Wisdome, sometimes Theologie, by his followers and Interpreters called Metaphysick, from the order thereof, as Alexander Aphrodisaeus and Philoponus affirm, being placed after Physick, as treating of a lesse known, and more noble object.
Upon this subject, there are fourteen bookes of Aristotle ex∣tant, which, saith Alexander Aphrodisaeus, by the method of the discourse and stile, are easily evinced to be his.
a 1.1 Metaphysick considereth Ens as it is Ens, and the primary cause thereof.b 1.2 Ens is Analogous, praedicated primarily of sub∣stance, which is one essence; of Accidents, not simply, but in re∣gard of their common attribution to substance. Ens thus being one analogically, the science therof is one likewise; but it treateth chiefly of substance, because that is the first essence upon which the rest depend, and from which they are deno∣minated.
CHAP. II.
Of the first Principle.
THe first most common axiom,* 1.3 or complex principle, is this▪ It is impossible that the same thing should be and not be in the same, and according to the same respect.
To this principle,* 1.4 all demonstrations and opinions are redu∣ced. It is it selfe indemonstrable, as being the first; otherwise there would be an infinite progression in demonstration, and consequently no demonstration. There is nothing more known by which it may be proved, no greater absurdity then the deny∣all of it, that an adversary can be reduced to.
With the first negative principle,* 1.5 the first affirmative hath a near affinity. It is necessary that every thing be predicated affirmatively or negatively of another. It is not true in matter of a future contin∣gent determinately, but only indeterminately. This affirmative