“A clean and tidy classification which awakens a sense of completeness and of a proper emphasis upon the individual parts, is an intellectual pleasure, though it must not be allowed to cloak the danger of arbitrariness and subjectivism. How difficult it is, in fact, to interpret in any detail, even the most certain, universally valid, objective classifications of being, life and death for example, good and evil, ugly and beautiful, will, reason and feeling! How almost impossible it is to penetrate their inter- relationship!” (Theodor Haecker, 1950, Journal in the Night)