When I subsume under a pure practical law an
action possible to me in the world of sense, I am not concerned with
the possibility of the action as an event in the world of sense.
This is a matter that belongs to the decision of reason in its
theoretic use according to the law of causality, which is a pure
concept of the understanding, for which reason has a schema in the
sensible intuition. Physical causality, or the condition under which
it takes place, belongs to the physical concepts, the schema of
which is sketched by transcendental imagination. Here, however, we
have to do, not with the schema of a case that occurs according to
laws, but with the schema of a law itself (if the word is allowable
here), since the fact that the will (not the action relatively to
its effect) is determined by the law alone without any other
principle, connects the notion of causality with quite different
conditions from those which constitute physical connection.
The physical law being a law to which the objects of sensible
intuition, as such, are subject, must have a schema corresponding to
it- that is, a general procedure of the imagination (by which it
exhibits a priori to the senses the pure concept of the
understanding which the law determines).
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