Naqli & 'Aqli

Much of the book develops implications of a distinction between two ways of knowing that is basic to the great religions under a variety of nomenclature, though it is typically ignored in discussions of contemporary issues. Islamic sources speak about it in a variety of ways. Here I focus on a standard differentiation that is made between "transmitted" (naqli) and "intellectual" ('aqli).

 Transmitted knowledge is characterized by the fact that it needs to be passed from generation to generation. The only possible way to learn it is to receive it from someone else. In contrast, intellectual knowledge cannot be passed on, even though teachers are needed for guidance in the right direction. The way to achieve it is to find it within oneself, by training the mind or, as many of the texts put it, "polishing the heart." Without uncovering such knowledge through self-discovery, one will depend on others in everything one knows.

-William C. Chittick, Science of the Cosmos, Science of the Soul: The Pertinence of Islamic Cosmology in the Modern World, viii.