والجواهر وهي أي ما له قيام بذاته من العالم
Substances are those things in the world that subsist in themselves.
Jawhar is not used in its everyday sense of a jewel or precious stone, but as a technical category of being. A thing not treated as a color or quality inhering in another is considered within the discussion of substance.
The next question is whether a substance is composite or noncomposite. This division leads to the definitions of body and indivisible substance.