Task: Text Categorization
Input (English): A little-read second part of this work contains such sections as the sixteenth, on The Need for Metaphysics; for forty-forth, on The Metaphysics of Sexual Love; and the thirtieth, on The Pure Subject of Knowing, which holds that that pure subject is one of the titular concepts. This work opens by drawing a parallel between that same titular concept, the root of causality and unique object of experience, and the Ding an sich of Kant, which this books author claims is not only knowable, but is all that is known. More famous is the authors claim in the second-half books that salvation can only come through subversion of the individual spirit, especially by the power of art, especially music; a doctrine known as the authors Pessimism. For ten points, name this magnum opus of Arthur Schopenhauer.
Output (English): Social Science