Aristotle

“ From what causes mistakes arise with regard to the discovery of the Universal. How they may be avoided Chap. VI.: Demonstration is founded on Necessary and Essential Principles Chap. VII.: The Premises and the Conclusion of a Demonstration must belong to the same genus Chap. VIII.: Demonstration is concerned only with what is eternal Chap. IX.: Demonstration is founded not on general, but on special and indemonstrable principles; nor is it easy to know whether one really possesses knowledge drawn from these principles Chap. X.: The Definition and Division of Principles Chap. ”

“ The longest-living author of this work died in 1930, so this work is in the public domain in countries and areas where the copyright term is the author's life plus 92 years or less. This work may be in the public domain in countries and areas with longer native copyright terms that apply the rule of the shorter term to foreign works. ”