For, should anything external to him, and in no way connected with him by right, affect this object, it could not affect himself as a subject, nor do him any wrong, unless he stood in a relation of ownership to it.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.This essay hopes to serve as preparation for an appropriate answer, by examining some already known philosophical theses which have to do with the questions of physics.