The City Of God Of St Augustine, After A 15th Century Engraving. The Upper Enclosure Represents Saints Who Have Been Received Into Heaven. The Seven Enclosures Below Show Those Preparing Themselves For Heaven By Exercising Christian Virtues, Or Who Are Excluding Themselves By Committing One Or Other Of The Seven Capital Sins. From "Science And Literature In The Middle Ages" By Paul Lacroix, Published London, 1878.