What is at stake in that form of inquiry that the western philosophical tradition has called “first philosophy” or “metaphysics”? Is it an abstract, now outmoded branch of philosophy, or does it address a problem that is still of great interest – namely the unity of western knowledge?In fact, metaphysics is “first” only in relation to the other two sciences that Aristotle called “theoretical”: the study of nature (phusikē) and mathematics. It is the strategic sense of this “primacy” that needs t...