No More Learning

If, with Hume, I had denied to the notion of causality all objec- tive reality in its [theoretic] use, not merely with regard to things in themselves (the supersensible), but also with regard to the objects of the senses, it would have lost all significance, and being a theoreti- cally impossible notion would have been declared to be quite use- less; and since what is nothing cannot be made any use of, the prac- tical use of a concept           null would have been absurd.