The soul is in God and God in the soul, just as the fish is in the sea and the sea in the fish.
St. Catherine of SienaThe city is the image of the soul, the surrounding walls being the frontier between the outward and inward life. The gates are the faculties or senses connecting the life of the soul with the outward world. Living springs of water rise within it. And in the centre, where beats the heart, stands the holy sanctuary.
St. Catherine of Siena