Confessions - pg. 154

Great is this power of memory, exceeding great, O my God -- an inner chamber large and boundless! Who has plumbed its depths? Yet it is a power of mine, and appertains unto my nature; nor do I myself grasp all that I am. Therefore is the mind too narrow to contain itself. And where should that be which it does not contain of itself? Is it outside and not in itself? How is it, then, that it does not grasp itself? A great admiration rises upon me; astonishment seizes me. And men go forth to wonder at the heights of mountains, the huge waves of the sea, the broad flow of the rivers, the extent of the ocean and the courses of the stars, and omit to wonder at themselves; nor do they marvel that when I spoke of all these things, I was not looking on them with my eyes, and yet could not speak of them unless those mountains, and waves, and rivers, and stars which I saw, and that ocean which I believe in, I saw inwardly in my memory, and with the same vast spaces between as when I saw them abroad. But I did not by seeing appropriate them when I looked on them with my eyes; nor are the things themselves with me, but their images. And I knew by what corporeal sense each made impression on me.