The dissertation presents a novel interpretation of Nietzsche's Beyond Good and Evil as an argument for the philosophical life, centered on a close reading of the first 29 aphorisms as an interconnected sequence. I argue that Nietzsche’s aim is to recover the ancient idea of philosophy as a way of life, while grounding his conception of first philosophy as psychology, which he calls “the queen of the sciences.” This psychology is a reflexive inquiry into embodied subjectivity, with important analogies to German Idealism. Like Kant and Hegel, Nietzsche steers a middle course between skepticism and dogmatism, and opposes both traditional conceptions of first philosophy (metaphysics as cosmology, theology or general ontology) and empiricist or...