VII. Are There Limits to Knowing?

When metaphysical realism asserts that, besides the ideal relationship between the object of perception and in perceiving subject, there must exist in addition a real relationship between the “thing-in-itself” of the perception and the “thing-in-itself” of the perceivable subject (of the so-called individual spirit), then this assertion rests upon the incorrect assumption of an unperceivable real process analogous to the processes of the sense world. When metaphysical realism states further that I come into a consciously ideal relationship with my world of perception, but that I can only come into a dynamic (force) relationship with the real world—then one commits no less the error already criticized. One can speak of a relationship between forces only within the world of perception (in the sphere of the sense of touch), but not outside it.