Religious symbolism is generous with the number nine, which represents patience and meditation. It's the number of harmony and represents perfection of ideas and inspiration.
Nine is also said to be the number of achievement, according to RidingTheBeast.com. It was considered sacred in ancient Greece and Egypt. For the Aztecs, it symbolized the terrestrial and nocturnal things. It is also said to be the number of hierarchy, being represented by nine choruses of the angels. In the Bible, St. Paul listed nine spiritual gifts of God.
The number nine is used 50 times in the Bible and three times in the Qu'ran.