The Seven Deadly Sins
The seven deadly sins are considered "deadly" because it is believed they can do terrible damage to the soul. The now-famous list does not appear in the Bible and may have been made by St. Gregory the Great (540-604). The deadly sins are sometimes known as "capital" or "cardinal" sins.
The idea that there are seven deadly sins was of great interest during the Middle Ages. At that time the deadly sins were a popular theme among Christian thinkers, artists, and writers such as Dante and Chaucer.