New answers tagged causality
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"Lack" means "privation". A blind man has a lack or privation of something due to his nature (the ability to see, in this case). Privation differs from negation. A rock is non-seeing (negation) because the ability to see is not part of a rock's nature; one does not say a rock is blind, but non-seeing.
St. Thomas Aquinas's short work On ...
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