The Number Seven

"Seven is universally the number of completeness.  The time-periods of creation were seven.  The spectrum of light consists of seven colors; the musical scale of seven notes, our division of time is into weeks of seven days; our physiological changes run in cycles of seven years.  Man himself is a seven-fold organism in correspondence with all these and the normal years of his life are seven multiplied by 10."

- Walter Leslie Wilmshurst, FURTHER NOTES ON CRAFT SYMBOLISM