Text 20.  “Every J is B” is considered at times according to the essence (whereupon it's called “essentialist”, as though [the subject] is an essence in a proposition used in the sciences), and at other times according to external reality (whereupon it's called “externalist”, and what is meant by “external” is what is external to the senses).  (Tahtânî 1948: Tahrîr 94.6–8)