hindrance. For if two are to become one, one must be passive whereas the other must act. If, for instance, my eye is to receive an image on the wall, or anything whatever, it must first be free from other images; for if there remained an image of color, it could not receive another. The same is true of the ear: If it already perceived a sound, it cannot hear another. In short, whatever should receive must first be empty, passive, and free. In regard to this Saint Augustine said: “Pour out that you