11. Do we think we have knocked? Is there raised up within us something whereby we may even slightly conjecture whence light may come to us? It is my opinion, brethren, that when we speak of these things, and meditate upon them, we are exercising ourselves. And when we are exercising ourselves, and are as it were bent back again by our own weight to our customary thoughts, we are like weak-eyed persons, when they are brought forth to see the light, if perchance they had no sight at all before, and begin in some sort to recover their sight by the assiduous care of physicians. And when the physician would test the progress of recovery, he tries to show them something which they sought to see, but could not while they were blind: and while the eyesight is now somewhat recovered, they are brought forth to the light; and as they see it, are beaten back in a manner by the very glare; and they answer the physician, as he points out the object, This moment I did see, but now I cannot. What then does the physician? He brings them back to their usual ways, and applies the eye-salve to nourish the longing for seeing that which was seen only for a moment, so that by the very longing he may cure more completely; and if any stinging salves are applied for the recovery of sound