We shall see that both assertions are inexact, and that the decisive point of quantum mechanics consists in the fact that it gives up the 'objectifiability' of natural processes.What interests us primarily in this is the question whether quantum mechanics has, as has often been said, given up the perceptibility of the description of nature, and the causal principle.his postulate may be called "a permissive law" of the practical reason, as giving us a special title which we could not evolve out of the mere conceptions of right generally.