Seven has always been considered a special number. To the Egyptians, for example, the Earth was represented by a four-sided house in which three Gods dwelled, which added up to seven. This became their lucky number.
Seven really came into its own with the Christian interpretation of Creation:
The world was made in seven days.
There are seven days a week.
There are seven graces.
There are seven stanzas in the Lord's Prayer.
There are seven ages of man.
Christ uttered seven last words.
Most of the above beliefs are ruled by the different phases of the moon, which change every seven days.
The Romans believed that the mind and the body changed completely and were renewed after seven years. They also started the seven year's bad luck concept.
Seventh-Heaven is an Islamic concept, and it represents the best of all possible places. It is the heaven of heavens, the residence of God and his angels. There is also a very early Islamic belief that there are seven heavens, one lying right above the other, graduating in degrees; depending upon how good a person was on Earth, he or she could say, "I'm in Seventh-Heaven."
Seven is especially lucky for gamblers.
The seventh son born to the seventh son is thought to be doubly blessed. He is believed to be a clairvoyant, with natural healing powers. Throughout the Middle Ages, the seventh son usually practiced magic and administered the laying on of hands to the sick.
(Ymas et.al. 2002)
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