But then metaphysics also has the rare good fortune, enjoyed by no other rational science that has to do with objectsO (for logic deals only with the form of thinking in general), which is that if by Bxxiv this critique it has been brought onto the secure course of a science, then it can fully embrace the entire field of cognitions belonging to it and thus can complete its work and lay it down for posterity as a princi pal frameworkb that can never be enlarged, since it has to do solely with principlesc and the limitations on their use, which are determined by the principles themselves.