On the Allegories of the Sacred Laws (1.6-1.10)

Therefore the expression, he caused to rest, is very appropriately employed here, not he rested. For he makes things to rest which appear to be producing others, but which in reality do not effect anything; but he himself never ceases from creating. On which account Moses says, He caused to rest the things which he had begun. For all the things that are made by our arts when completed stand still and remain; but all those which are accomplished by the knowledge of God are moved at subsequent times. For their ends are the beginnings of other things; as, for instance, the end of day is the beginning of night. And in the same

And so the generation of other things which are destroyed, and the destruction of others which are generated is completed, so that that is true which is said that— And nought that is created wholly dies; But one thing parted and combined with others Produces a fresh form.

But nature delights in the number seven. For there are seven planets, going in continual opposition to the daily course of the heaven which always proceeds in the same direction. And likewise the constellation of the Bear is made up of seven stars, which constellation is the cause of communication and unity among men, and not merely of traffic. Again, the periodical changes of the moon, take place according to the number seven, that star having the greatest sympathy with the things on earth. And the changes which the moon works in the air, it perfects chiefly in accordance with its own configurations on each seventh day.

At all events, all mortal things, as I have said before, drawing their more divine nature from the heaven, are moved in a manner which tends to their preservation in accordance with this number seven. For who is there who does not know that those infants who are born at the end of the seventh month are likely to live, but those who have taken a longer time, so as to have abided eight months in the womb, are for the most part abortive births?

And they say that man is a reasoning being in his first seven years, by which time he is a competent interpreter of ordinary nouns and verbs, making himself master of the faculty of speaking. And in his second period of seven years, he arrives at the perfection of his nature; and this perfection is the power of generating a being like himself; for at about the age of fourteen we are able to beget a creature resembling ourselves. Again, the third period of seven years is the termination of his growth; for up to the age of one and twenty years man keeps on increasing in size, and this time is called by many maturity.