Sedentary culture is the goal of civilization. It means the end of its lifespan and brings about its corruption.

All the sciences came to exist in Arabic. The systematic works on them were written in Arabic writing.

Therefore, the Negro nation are, as a rule, submissive to slavery, because [Negroes] have little [that is essentially] human and have attributes that are quite similar to those of dumb animals, as we have stated.

The past resembles the future more than one drop of water resembles another.

Man is the child of customs, not the child of his ancestors.

Eventually, Aristotle appeared among the Greeks. He improved the methods of logic and systematized its problems and details. He assigned to logic its proper place as the first philosophical discipline and the introduction to philosophy. Therefore he is called the First Teacher.

At the beginning of a dynasty, taxation yields a large revenue from small assessments. At the end of the dynasty, taxation yields a small revenue from large assessments.