Let us not pass by such a model of the most excellent ways of life, the practical and the contemplative; but let us always keep our eyes fixed upon it, and stamp a visible image and representation of it on our own minds, making our mortal nature resemble, as far as possible, his immortal one, in respect of saying and doing what is proper. And in what sense it is said that the world was made by God in six days, who never wants time at all to make anything, has been already explained in other passages where we have treated of allegories.


 Now, those who have applied themselves to mathematical studies, fully explain the precedence and pre-eminence to which the number seven is entitled among all existing things, tracing it out with great care and exceeding minuteness and accuracy; for among numbers seven is the virgin number, the nature which has no mother, that which is most nearly related to the unit, the foundation of all


 


 numbers; the idea of the planets, just as the unit is of the immovable sphere; for of the unit and the number seven consists the incorporeal heaven, the model of the visible heaven, and the heaven is made up of indivisible and divisible nature. Now, indivisible nature has assigned to it the first, and highest, and immovable circumference, which the unit inspects and overlooks; but the divisible nature has received that circumference which is inferior both in power and in arrangement, which the number seven inspects, which, being divided into six parts, has produced what are called the seven planets;