96. That spiritual light is altogether distinct from natural light, any one may know if he observes the thoughts of his mind. For when the mind thinks, it sees its objects in light, and they who think spiritually see truths, and this at midnight just as well as in the daytime. For this reason light is predicated of the understanding, and the understanding is said to see; thus one sometimes declares of something which another says that he sees (that is, understands) that it is so. The understanding, because it is spiritual, cannot thus see by natural light, for natural light does not inhere in man, but withdraws with the sun. From this it is obvious that the understanding enjoys a light different from that of the eye, and that this light is from a different origin.