Arcana Coelestia#1372
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.
Thirteen years
'The thirteenth year' in Genesis 14:4 signifies the beginning of the Lord's temptations in childhood.
In Genesis 17:25, this signifies a state of holy remains.
(参照: Arcana Coelestia 2109)