 Kant responded to the empiricist-rationalist tension by reigning in their overweening ambitions; he argued that philosophy must stop attempting to transcend the limits of thought and experience. Philosophy’s proper aspiration is more modest—to discover what is possible to know in the phenomenal world. Kant, then, refused an originary role to either percepts or concepts, arguing instead that sense and reason are co-constitutive of knowledge. More important, Kant argued that what epistemology requires is an account of the mind as a systematic and constructive force.