must be their source, and nowhere else!”⁠—This mode of reasoning discloses the typical prejudice by which metaphysicians of all times can be recognized, this mode of valuation is at the back of all their logical procedure; through this “belief” of theirs, they exert themselves for their “knowledge,” for something that is in the end solemnly christened “the Truth.” The fundamental belief of metaphysicians is the belief in antithesis of values . It never occurred even to the wariest of them to doubt here on the very threshold (where doubt, however, was most necessary); though they had made a solemn vow, “ de omnibus dubitandum