Genus, species and differentia are essential universals because they concern essence.
Other things can be true of a human:
Zayd is learned — learning is an acquired characteristic.
Zayd walks — walking is an action or capacity.
Such facts do not by themselves constitute human essence. The book now distinguishes property from common accident within accidental universals.
Opening interactive controls...
Turning to accidental universals
The Five Universals: Genus, Species, Differentia, Property, Common Accident
Genus, species and differentia are essential universals because they concern essence.
Other things can be true of a human:
Zayd is learned — learning is an acquired characteristic.
Zayd walks — walking is an action or capacity.
Such facts do not by themselves constitute human essence. The book now distinguishes property from common accident within accidental universals.