VII. Are There Limits to Knowledge?

When the metaphysical realist maintains that beside the ideal relation between the perceptual object and the perceiving subject, there must also exist a real relation between the “thing-in-itself” of the perception and the “thing-in-itself” of the perceptible subject (of the so called individual spirit), then this assertion is due to the mistaken assumption of the existence of a process, analogous to a process in the sense-world, but imperceptible. Further, when the metaphysical realist says: I have a conscious ideal relationship with my world of perceptions, but with the real world I can have only a dynamic (force) relationship, he then makes the above mistake to an even greater degree. One can only speak of a force-relationship within the world of perceptions (in the sphere of the sense of touch), not outside that sphere.