 At [Expressions] 86.17–87.4 al-Fārābī tells us that teaching has three steps: “conceptualization” (taṣawwur), where we understand what the concept is and what our teacher is telling us about it; taṣdīq; and “committing to memory”  (hifẓ).[21]  [Demonstration] 80.22, in another passage on teaching, adds that “We can seek taṣdīq either of simple things or of compound”. For al-Fārābī a proposition is always compound, so he is telling us that non-propositional concepts can be assented to.