Arcana Coelestia # 6231
6231. 'And he said to me, Behold, I am making you fruitful and will cause you to be multiplied' means a bestowal of life through the good of charity and the truth of faith. This is clear from the meaning of 'being made fruitful' as that which has regard to the good of charity, and of 'being multiplied' as that which has regard to the truth of faith, dealt with in 43, 55, 913, 983, 2846, 2847. Since these are what bestow life on a person, the expression 'a bestowal of life through them' is used.
