And what did it profit me, that all the books I could procure of the so-called liberal arts, I, the vile slave of vile affections, read by myself, and understood? And I delighted in them, but knew not whence came all, that therein was true or certain. For I had my back to the light, and my face to the things enlightened; whence my face, with which I discerned the things enlightened, itself was not enlightened.