Epistemic and ontological unity

Take sensation: the warmth in the object becomes the warmth in my hand, the air the trumpet shakes is the same air that shakes my eardrum. Two substances cannot be one in number, so the ontological unity that grounds the sentient act is numerically one and the same form shared by distinct physical subjects, and so must be accidental. Contrapositively, if there is an ontological unity grounding intellective knowledge of substantial form it cannot be of physical subjects, and since the substantial forms of our experience are manifestly physical subjects, the intellective power that knows them cannot be.

 

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