1372. This becomes clear from the meaning of 'barren', dealt with elsewhere, for, as shown already, 'son' and 'daughter' mean truth and good, and in the contrary sense evil and falsity. Consequently 'barren' means that the evil and falsity of idolatrous worship were no longer reproducing themselves.

'Thirty' has a twofold significance because it is is the product of five and six, and also three and ten. From five multiplied by six, it signifies some aspect of combat, because 'five' signifies some part or aspect, and 'six,' combat. From three multiplied by ten, it signifies something full of remains of good and truth, because 'three' signifies fullness, and 'ten,' remains of good and truth. A composite number involves the same as the simple numbers it has as its factors.

(Референци: 2 Samuel 5:4; Arcana Coelestia 5335; Luke 3, 3:23, 23; Numbers 4:3, 4:23, 4:30)