What is, in respect to sense and validity, the objective world, objectively true being, and also the objective truth of science, once we have seen universally with Hume (and in respect to nature even with Berkeley) that world is a validity which has sprung up within subjectivity, indeed speaking from my point of view, who am now philosophizing one which has sprung up within my subjectivity, with all the content it ever counts as having for me?