If in using principles of the understanding we apply our reason not merely to objects of experience, for the use of principles of understanding, but instead venture also to extend these principles beyond the boundaries of experience, then there arise sophistical theorems,b which may neither hope for confirmation in experience nor fear refutation by it; and each of them is not only without contradiction in itself but even meets with conditions of its necessity in the nature of reason itself, only unfortunately the opposite has on its side equally valid and necessary grounds for its assertion.