Sphere Quotes - page 10
A science that observes the laws of causation, and so is value-free, threatens human freedom and man's religious, ethical, and legal responsibility. The philosophy of values raised to that challenge, in the sense that it opposed a sphere of values, as a realm of ideal valuations, to a sphere of being that was only causally understood. It was an attempt to assert the human being as a free, responsible creature, indeed not in itself, but at least, in its valuation, what one called value. That attempt was put forth as a positivistic substitute for the metaphysical.
Carl Schmitt
The mark of Platonic philosophy is a radical dualism. The Platonic world is not one of unity; and the abyss which in many ways results from this bifurcation appears in innumerable forms. It is not one, but two worlds, which Plato sees when with the eyes of his soul he envisages a transcendent, spaceless, and timeless realm of the Idea, the thing-in-itself, the true, absolute reality of tranquil being, and when to this transcendent realm he opposes the spacetime sphere of his sensuous perception-a sphere of becoming in motion, which he considers to be only a domain of illusory semblance, a realm which in reality is not-being.
Hans Kelsen