Ability (n.) expressed by can turns a description of an action into a description of the instrument.
Ability (n.) is not a hidden process that shows itself in symptoms, the way an inflamed nose shows itself in sneezing; what stands 'behind' saying the formula is only the circumstances in which it is said.
Ability (n.) is pictured as a state existing at the moment we speak, because "He can play chess" is in the present tense — a metaphor built into our grammar.
An Ability (n.) is not an experience; even if a feeling always went with a capacity, the feeling would not be the capacity.
Ability (n.) seems like a shadow of the doing, as the sense of a sentence seems the shadow of a fact — but no shadow is the event.