Here are some bits on seven I wrote for a book that should be coming out next year, fingers crossed!!
A sense of fulfilment pervades seven because it brings together the elemental world (four, as in four elements) with the spiritual world (three, as in the God & Goddess issuing forth from the unknowable source of zero). Seven is also the number of the Moon and all her feminine mysteries, because 1+2+3+4+5+6+7 equals twenty-eight, the number of days it takes for the Moon to complete her cycle, and the number of days in the menstrual cycle.
Seven is also barren like the Moon, in that it is not generated (it cannot be created by any figures in the decad, & therefore universe, by multiplication), and doesn’t generate anything in the universe (i.e. nothing in the decad is made by a number multiplied by seven). Due to its unfruitful nature the number seven is virginal, clean and pure, and furthermore outside of time, as a result seven becomes regent over time itself. The link with time is seen in the week, where after seven days the week is renewed, and in the musical scale where after seven notes we reach the eighth, which is the same as the first. Both of these examples furnish us with the means by which we may see how seven comes to influence fulfilment, progress and change.
BB
Martin