In the classical definition 'rational animal,' 'rational' is the distinguishing component that separates the human kind from other animal kinds in this framework.
'Animal' is not the whole human essence, but belongs to it.
'Rational' is likewise a component, not the whole.
Their combination expresses the specific human nature. Later the source formally introduces genus, species, and differentia for these roles.
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Why rational is also an essential component
Essence, Quiddity, and Essential vs Accidental Universals
In the classical definition 'rational animal,' 'rational' is the distinguishing component that separates the human kind from other animal kinds in this framework.
'Animal' is not the whole human essence, but belongs to it.
'Rational' is likewise a component, not the whole.
Their combination expresses the specific human nature. Later the source formally introduces genus, species, and differentia for these roles.