I want to speak about the place of Fides et Ratio within the parameters of the twentieth century Thomistic revival. To do that I must first describe the revival Three strains of Thomistic interpretation characterized the revival before Vatican II: Aristotelian Thomism, Existential Thomism and Transcendental Thomism. The first two were a posteriori in their epistemology. The mind abstractly draws its fundamental conceptual content from the human knower’s contact with the self-manifestly real things given in sensation. Among the concepts abstracted are the transcendentals, chief among which is the ratio ends, the notion or concept of being. It is an analogical commonality, and so a sameness within difference, whose analogates are absolutely everything, actual and conceivable.