 Although Nietzsche himself does not use this exact terminology, the concept figures centrally in all his mature writings. A typical Nietzschean form of argument, for example, runs as follows: a person’s theoretical beliefs are best explained in terms of his moral beliefs; and his moral beliefs are best explained in terms of natural facts about the type of person he is (i.e., in terms of type-facts). So Nietzsche says, “every great philosophy so far has been…the personal confession of its author and a kind of involuntary and unconscious memoir”; thus, to really grasp this philosophy, one must ask “at what morality does all this (does he) aim” (BGE 6)? But the “morality” that a philosopher embraces simply bears “decisive witness to who he is” — i.e., who he essentially is — that is, to the “innermost drives of his nature” (BGE 6).