The claim 'he is laughing now' reports a current action. 'He has the capacity for laughter' speaks of a capability. These are not identical.
A sleeping child may not be laughing, but that does not by itself settle whether the child possesses the relevant human capacity.
A serious adult who is not laughing has not thereby lost the human nature.
The textbook's use of 'capable of laughter' should not be mistaken for laughing at every moment.
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Laughter now versus capacity for laughter
Essence, Quiddity, and Essential vs Accidental Universals
The claim 'he is laughing now' reports a current action. 'He has the capacity for laughter' speaks of a capability. These are not identical.
A sleeping child may not be laughing, but that does not by itself settle whether the child possesses the relevant human capacity.
A serious adult who is not laughing has not thereby lost the human nature.
The textbook's use of 'capable of laughter' should not be mistaken for laughing at every moment.