It excludes not only all doctrines which are false, but such also as are not well-grounded; for whatsoever we know by right ratiocination, can neither be false nor doubtful; and, therefore, _astrology_, as it is now held forth, and all such divinations rather than sciences, are excluded. Lastly, the doctrine of _God's worship_ is excluded from philosophy, as being not to be known by natural reason, but by the authority of the Church; and as being the object of faith, and not of knowledge. [Sidenote: Parts of Philosophy.] 9. The principal parts of philosophy are two. For two chief kinds of bodies, and very different from one another, offer themselves to such as search after their generation and properties; one whereof being the work of nature, is called a _natural body_, the other is called a _commonwealth_, and is made by the wills and agreement of men. And from these spring the two parts of philosophy, called _natural_ and _civil_. But seeing that, for the knowledge of the properties of a commonwealth, it is necessary first to know the dispositions, affections, and manners of men, civil philosophy is again commonly divided into two parts, whereof one, which treats of men's dispositions and manners, is called _ethics_; and the other, which takes cognizance of their civil duties, is called _politics_, or simply _civil philosophy_. In the first place, therefore (after I have set down such premises as appertain to the nature of philosophy in general), I will discourse of _bodies natural_; in the second, of the _dispositions and manners of men_; and in the third, of the _civil duties of subjects_. [Sidenote: Epilogue.] 10. To conclude; seeing there may be many who will not like this my definition of philosophy, and will say, that, from the liberty which a man may take of so defining as seems best to himself, he may conclude any thing from any thing (though I think it no hard matter to demonstrate that this definition of mine agrees with the sense of all men); yet, lest in this point there should be any cause of dispute betwixt me and them, I here undertake no more than to deliver the elements of that science by which the effects of anything may be found out from the known generation of the same, or contrarily, the generation from the effects; to the end that they who search after other philosophy, may be admonished to seek it from other principles. ------- CHAPTER II. OF NAMES.