Quaestionen zur Metaphysik des Aristoteles, Buch I. Quaestiones super libros Metaphysicorum

Duns Scotus' investigations into the metaphysics of Aristotle represent a groundbreaking turning point in the history of philosophy: while the discussion up until the 13th century primarily revolved around whether the fundamental philosophy aimed at by Aristotle ultimately concerns God or substances in general, Scotus poses the critical question about the concepts that underlie and transcend all concrete knowledge. This transforms metaphysics into a transcendental science – a project that would later influence Kant's Critique of Pure Reason.