You have one cell outwardly, another within you. The outward cell is the house in which your soul dwells together with your body; the inner cell is your conscience and in that it is God who should dwell with your spirit, he who is more interior to you than all else that is within you. The door of the outward enclosure is a sign of the guarded door within you, so that as the bodily senses are prevented from wandering abroad by the outward enclosure, so the inner senses are kept always within their own domain.