 Although there is an incalculable gulf fixed between the domain of the concept of nature, as the sensible, and the domain of the concept of freedom, as the supersensible, so that from the former to the latter (thus by means of the theoretical use of reason) no transition is possible, just as if there were so many different worlds, the first of which can have no influence on the second: yet the latter should have an influence on the former, namely the concept of freedom should make the end that is imposed by its laws real in the sensible world, and nature must consequently also be able to be conceived in such a way that the lawfulness of its form is at least in agreement with the possibility of the ends that are to be realized in it in accordance with the laws of freedom. (CPJ, Introduction, section II, 5:174–5; see also section IX, 5:195–6)