In this last episode, Ibn Khaldun explores the nature and hierarchy of the sciences, emphasizing human reason as the source of man’s superiority over animals and his path to perfection.

He distinguishes three levels of intellect — discerning, experiential, and speculative — that enable humanity to organize action and pursue existential refinement.

A large portion of the text is devoted to the classification of knowledge into philosophical (rational) and traditional (transmitted) sciences, with detailed reflections on logic, speculative theology, Sufism, astrology, and alchemy — disciplines whose validity or orthodoxy he often questions.

Finally, Ibn Khaldun discusses how scientific education is a craft requiring habit and discipline, and how flourishing sedentary civilizations foster the growth of learning and the excellence of scholars — many of whom, he notes, were non-Arabs in the Islamic world.