But here it is not at all the intenta to prove the unconditionally necessary existence of any being, or even to ground the possibility of a merely intelligible condition of existence in the world of sense on it; rather, just as we limit reason so that it does not abandon the thread of the empirical conditions, and stray into transcendent grounds of ex planation which do not admit of any exhibition in concreto, so on the other side we limit the law of the merely empirical use of the under standing, so that it does not decide the possibility of things in general, nor declare the intelligible, even though it is not to be used by us in ex plaining appearances, to be impossible.