Why is Abraham said to have been eighty and six years old when Hagar bore Ishmael to him?
[Genesis 16:16]. 38. Because the number which follows eighty, that is to say six, is the first perfect number, being equal to its parts, and being the first number which is composed of the multiplication of an odd and an even number; receiving also something from its efficient cause according to the odd or redundant number, and from its material and effective cause according to the even number. On which account, among the most ancient of our ancestors, some persons have called it matrimony, and others harmony; and our sacred historian too has divided the creation of the world into six days. But among numbers, eighty rejoices in perfect harmony, since it is composed of two generous diameters in a double and treble proportion, according to the figure of a square of four sides. And it contains within itself all the four inferences; the arithmetical, and the geometrical, and the harmonious one. Being in the first place composed of double numbers, as of six, eight, nine, twelve, the union o
