Pythagoras considered the number 1 to be the generator of all other numbers. It was used to characterize reason.
The number 2 was the first female number. It was the number of opinion and division.
The Chinese yin and yang express the same sentiments: Yin represents the feminine and negative principle,
like passivity and darkness. The yang represents the bright and masculine principle.
Pythagoras viewed the number 3 as masculine. It has a beginning, a middle, and an end.
4 was the number of justice and order.
5 represents the union of the first female number 2 and the first male number 3,
and as such it was the number of love and marriage.
6 is the first perfect number: 6 = 1 + 2 + 3
6 is the product of the first female number (2) and the first male number (3).
10 was the most revered number because it represented the cosmos as a whole.
(1 + 2 + 3 + 4 = 10)
10 combined all the properties of
uniqueness (expressed by 1)
polarity (expressed by 2)
harmony (expressed by 3) and
space and matter (expressed by 4)