 Some of the historical processes mentioned above will have the effect of making people think about the primary concepts and their regime. Al-Fārābī points out that as a result, people will now have concepts that classify concepts in the soul rather than identifiable objects in the external world. So these are a new kind of concept, and al-Fārābī calls them “secondary concepts” (often translated as “second intelligibles”). Thinking about secondary concepts will give us “tertiary concepts”, and so on to infinity. As examples of secondary concepts, al-Fārābī mentions “genus”, “species”, “more/less inclusive”, “known”, “concept”. (All this is in [Letters] (7,8)  64.9–65.8.)[6]