 Malebranche takes the conclusion here to confirm the view in “an infinity of passages” in Augustine that “we see God” in knowing eternal truths. This appeal to the Augustinian theory of divine illumination provides the basis for an argument for the vision in God that bypasses the unusual enumeration in the Recherche. This more direct argument is introduced in “Eclaircissement X,” where Malebranche urges that the ideas we perceive must exist in an “immutable and necessary Reason” since they are themselves immutable and necessary (Malebranche [OC], 3:129f). Malebranche emphasizes that the Augustinian view that eternal truths derive from uncreated features of the divine intellect conflicts directly with the voluntarist conclusion in Descartes that these truths derive rather from God’s free and indifferent will. Particularly in his exchanges with Arnauld, Malebranche attempts to present his doctrine of the vision in God as a natural consequence of Descartes’ account of ideas. However, his Augustinian argument serves to show that Descartes himself could not have accepted this doctrine. Moreover, such an argument reveals the most fundamental reason for Malebranche’s rejection of Arnauld’s Cartesian identification of ideas with our own perceptions. Since Malebranche identifies these ideas with necessary and immutable essences, and since he holds that these ideas derive their necessity and immutability from the divine intellect, he concludes that Arnauld’s position can only result in a radical subjectivism that renders impossible any sort of a priori knowledge of the material world.