7. Are There Limits to Knowledge?

It is from a dualism such as this that there arises the distinction between the perceptual object and the thing-in-itself, which Kant introduced into philosophy, and which, to the present day, we have not succeeded in eradicating. According to our line of argument, it is due to the nature of our mental organization that a particular thing can be given to us only as a percept. Thinking then overcomes this particularity by assigning to each percept its rightful place in the world as a whole. As long as we designate the separated parts of the world as percepts, we are simply following, in this separating out, a law of our subjectivity. If, however, we regard the sum of all percepts as the one part, and contrast with this a second part, namely, the things-in-themselves, then we are philosophizing into the blue. We are merely playing with concepts. We construct an artificial pair of opposites, but we can gain no content for the second of these opposites, since such content for a particular thing can be drawn only from perception.